Dell PowerVault LTO4-120 Performance Considerations for Tape Drives and Librar
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- Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 1
Dell™ PowerVault™ Systems Performance Considerations for Tape Drives and Libraries www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 2
rights reserved. Reproduction in any manner whatsoever without the written permission of Dell Inc. is strictly forbidden. Trademarks used in this text: Dell, the DELL logo, and PowerVault are trademarks of Dell Inc.; EMC and PowerPath are registered trademarks of EMC Corporation. Other trademarks - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 3
Contents Introduction 5 General Host Backup Considerations 5 Tape Drive and Data Considerations 5 Hard Drive and RAID Array Configuration 6 General Performance Considerations When Using Multiple Drives in Tape Libraries 12 SCSI Configurations 12 SAN Configurations 13 Contents 3 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 4
4 Contents - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 5
tape backup application User's Guide for specific details. Drivers and firmware. Always ensure that the SCSI or fibre controller and tape drive have the latest drivers and firmware installed. Visit support.dell.com to download the latest drivers and firmware for your Dell PowerVault tape product - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 6
speed, the test fails with an error message. No error message is displayed if the test passes. Consult your tape drive User's Manual for specific details on diagnostic mode "F." NOTICE: Diagnostic mode "F" requires media that can be safely overwritten as part of the diagnostic test. Do not use media - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 7
vs. Two-Channel Bandwidth Single Shared LUN Single LUN with Backup data and OS Separate LUNs OS LUN Backup Data LUN SCSI or RAID Controller SCSI or RAID Controller Tape Drive Tape Drive Hard Drive Performance By design, tape drives write data sequentially and require a constant data feed to - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 8
restoring data to the array or backing up data from the array. However, backup operations from external arrays with cache may still feel the impact of RAID configuration limitations because the data still needs to be read from the disks. 8 Performance Considerations for Tape Drives and Libraries - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 9
. Figure 1-2. Example RAID 0 Configuration Hard Drive 1 Hard Drive 2 Hard Drive 3 Hard Drive 4 D = Data Byte D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 SCSI or RAID Controller Tape Drive Performance Considerations for Tape Drives and Libraries 9 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 10
www.dell.com | support.dell.com RAID 1 Also known as mirroring, RAID 1 means data is written twice across two disks simultaneously. If one drive fails, the system switches to the other drive without losing data. During tape drive backups, the read rate from the RAID 1 array is approximately the - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 11
level and error correction data, Drive 1 Hard Drive 2 Hard Drive 3 Hard Drive 4 P = Parity Byte D = Data Byte P1 D1 D2 D3 D4 P2 D5 D6 D7 D8 P3 D9 D10 D11 D12 P4 D13 D14 D15 D16 Read/Write SCSI or RAID Controller Read/Write Tape Drive Performance Considerations for Tape Drives - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 12
www.dell.com | support.dell.com In conclusion, RAID 0 tends to be the best overall configuration for high-performance tape drives offered in tape libraries support the Ultra160 specification of the SCSI interface standard. Therefore, to achieve maximum performance, backup servers utilizing SCSI - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 13
performance limitations of external storage arrays. With an understanding of the overall setup and management of the solution, many of these factors can be avoided. Even with the high data bandwidth offered by the FC protocol in SANs, proper considerations must be made for tape drives in order to - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 14
HOST HOST Fibre Channel Switch Fibre Channel Switch Fibre Channel Switch Tape Library Fibre Channel Disk Array Tape Library Fibre Channel Disk Array At the same time, if a bottleneck exists in the data being read from an external FC disk array, the use of I/O management software such as EMC - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 15
features unavailable in most native FC libraries. For details on these features, see the Fibre Channel bridge User's Guide for your tape library. In some tape library configurations, the Fibre Channel bridge module may act as a bottleneck and decrease performance of tape drives. This is because the - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 16
www.dell.com | support.dell.com Recommended Cabling Configurations SCSI Cabling to the Host Tape Library With up to Six Tape Drives When the tape library is SCSI-attached to a host, ensure that no more than two drives are on a single bus. Additional SCSI controllers are required for libraries with - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 17
Two Tape Drives terminator Cabling Drives to the Fibre Channel Bridge Figures 1-10 through 1-17 illustrate how a tape library with up to six drives should be configured with a Fibre Channel bridge module in order to optimize tape performance over FC. Performance Considerations for Tape Drives and - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 18
www.dell.com | support.dell.com Figure 1-10. Fibre Channel Bridge Cabling With One Tape Drive library SCSI interface SCSI 1 terminator drive 1 18 Performance Considerations for Tape Drives and Libraries - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 19
Figure 1-11. Fibre Channel Bridge Cabling With Two Tape Drives library SCSI interface SCSI 1 SCSI 2 terminator drive 2 terminator drive 1 Performance Considerations for Tape Drives and Libraries 19 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 20
www.dell.com | support.dell.com Figure 1-12. Fibre Channel Bridge Cabling With Three Tape Drives library SCSI interface SCSI 1 SCSI 2 terminator drive 3 drive 2 terminator drive 1 20 Performance Considerations for Tape Drives and Libraries - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 21
Figure 1-13. Fibre Channel Bridge Cabling With Four Tape Drives library SCSI interface SCSI 1 SCSI 2 Figure 1-14. Channel Zoning Settings for Tape Library With One to Four Drives terminator drive 4 drive 3 terminator drive 2 drive 1 Performance Considerations for Tape Drives and Libraries 21 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 22
www.dell.com | support.dell.com Figure 1-15. Fibre Channel Bridge Cabling With Five Tape Drives library SCSI interface SCSI 3 SCSI 4 SCSI 1 SCSI 2 terminator drive 5 drive 4 terminator drive 3 drive 2 terminator drive 1 22 Performance Considerations for Tape Drives and Libraries - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 23
With Six Tape Drives library SCSI interface SCSI 3 SCSI 4 SCSI 1 SCSI 2 Figure 1-17. Channel Zoning Settings for Tape Library With Five or Six Drives terminator drive 6 terminator drive 5 drive 4 terminator drive 3 drive 2 terminator drive 1 Performance Considerations for Tape Drives and Libraries - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 24
www.dell.com | support.dell.com Figure 1-18 and Figure 1-19 illustrate how a tape library with up to two tape drives should be configured with a Fibre Channel bridge module in order to optimize tape performance over FC. Figure 1-18. Tape Library With One Drive terminator Figure 1-19. Tape Library - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 25
Dell™ PowerVault™ 系统 www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 26
2005 Dell Inc Dell Inc Dell、DELL 徽标和 PowerVault 是 Dell Inc EMC 和 PowerPath 是 EMC Corporation Dell Inc 2005 年 6 月 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 27
目录 29 29 29 RAID 30 36 SCSI 36 SAN 36 目录 27 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 28
28 目录 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 29
简介 RAID SCSI SAN SCSI SCSI SCSI 80 MB 77 MB 64 KB 64 KB CPU SCSI support.dell.com Dell PowerVault HBA HBA HBA SCSI/RAID RAID RAID RAID 29 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 30
www.dell.com | support.dell.com LTO 75 LTO 例如,Dell PowerVault 110T (LTO2 和 LTO3 LTO-3 30 MB 20 MB 20 MB 15 MB PowerVault 110T LTO-2 和 LTO-3(固件 53XX F F F RAID 不同 LUN OS LUN LUN 30 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 31
图 1-1 LUN 单一 LUN SCSI 或 RAID 控制器 独立的 LUN LUN LUN SCSI 或 RAID 控制器 RPM STR)。STR STR STR。 31 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 32
www.dell.com | support.dell.com 硬件 RAID RAID RAID RAID LUN 就 RAID Ultra160 40 MB 5 RAID 0 200 MB Ultra160 160 MB /秒。 SAN I/O RAID RAID RAID 0 RAID 0 LUN n n 图 1-2 RAID 0 32 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 33
图 1-2. 示例 RAID 0 配置 D 1 D1 2 D2 3 D3 4 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 SCSI 或 RAID 控制器 RAID 1 RAID 1 RAID 1 RAID 1 ECC CPU 或 RAID RAID 33 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 34
www.dell.com | support.dell.com 图 1-3. 示例 RAID 1 配置 D M 1 D1 2 M1 D2 M2 D3 M3 D4 M4 D5 M5 读/写 只写 SCSI 或 RAID 控制器 读/写 RAID 5 使用 RAID 5 RAID 5 RAID 0 RAID 5 34 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 35
图 1-4. 示例 RAID 5 配置 P D 1 P1 2 D1 3 D2 4 D3 D4 P2 D5 D6 D7 D8 P3 D9 D10 D11 D12 P4 D13 D14 D15 D16 读/写 SCSI 或 RAID 控制器 读/写 总之,RAID 0 RAID 1 RAID 5 RAID 5 RAID RAID 35 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 36
www.dell.com | support.dell.com SCSI 配置 SCSI Ultra160 SCSI HBA Ultra160 SCSI HBA SCSI 160 MB SCSI Ultra160 总线 160 MB 80 MB 160 MB SCSI Ultra160 Ultra160 的 SCSI HBA Ultra320 HBA SAN 配置 FC) 与 SCSI SCSI 300 2 Gb FC LVD SCSI 12 FC SCSI SAN FC FC 1-5。 图 1-5 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 37
在 SAN FC 即使 SAN 中的 FC FC 2 千兆位 (Gb) FC 200 MB 200 MB 200 MB 1 Gb 2 Gb SAN 1-6。 图 1-6 主机 主机 FC I/O EMC® PowerPath 1-7 SAN I/O 37 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 38
www.dell.com | support.dell.com 图 1-7 主机 最后,SAN 上的 FC RAID SAN SAN 配置 SAN SCSI 与 FC FC SCSI 与 FC 38 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 39
SCSI SCSI SCSI SCSI 图 1-8 SCSI 布线 SCSI 电缆 SCSI 电缆 SCSI 电缆 SCSI SCSI SCSI 39 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 40
www.dell.com | support.dell.com 图 1-9 SCSI 1-10 至图 1-17 FC 40 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 41
图 1-10 SCSI 接口 SCSI 1 1 41 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 42
www.dell.com | support.dell.com 图 1-11 SCSI 接口 SCSI 1 SCSI 2 2 1 42 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 43
图 1-12 SCSI 接口 SCSI 1 SCSI 2 3 驱动器 2 1 43 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 44
www.dell.com | support.dell.com 图 1-13 SCSI 接口 SCSI 1 SCSI 2 图 1-14 4 驱动器 3 2 驱动器 1 44 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 45
图 1-15 存储库 SCSI 接口 SCSI 3 SCSI 4 SCSI 1 SCSI 2 5 驱动器 4 3 驱动器 2 1 45 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 46
www.dell.com | support.dell.com 图 1-16 存储库 SCSI 接口 SCSI 3 SCSI 4 SCSI 1 SCSI 2 图 1-17 6 5 驱动器 4 3 驱动器 2 1 46 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 47
图 1-18 和图 1-19 FC 图 1-18 图 1-19 47 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 48
www.dell.com | support.dell.com 48 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 49
Systèmes Dell™ PowerVault™ Remarques sur les performances des lecteurs et des bibliothèques de bandes www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 50
de ce document de quelque manière que ce soit sans l'autorisation écrite de Dell Inc. est strictement interdite. Marques utilisées dans ce document : Dell, le logo DELL et PowerVault sont des marques de Dell Inc. ; EMC et PowerPath sont des marques déposées d'EMC Corporation. Tous les autres - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 51
Sommaire Présentation 53 Remarques générales sur la sauvegarde du système hôte 53 Remarques sur les données et les lecteurs de bande 53 Configuration des disques durs et des matrices RAID 55 Remarques générales sur les performances lors de l'utilisation de bibliothèques de bandes à plusieurs - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 52
52 Sommaire - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 53
à l'utilisateur de modifier cette taille. En revanche, l'utilisation de blocs de moins de 64 Ko risque de diminuer les performances. Reportez-vous au guide d'utilisation du logiciel de sauvegarde pour plus d'informations sur l'ajustement de la taille des blocs de l'unité de bande. Remarques sur les - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 54
des pilotes et du micro-code. Les pilotes et le micro-code les plus récents des lecteurs de bande Dell PowerVault peuvent être téléchargés à partir du site support.dell.com. Reliez les lecteurs de bande et les disques durs à des contrôleurs distincts (internes ou externes) se trouvant sur des cartes - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 55
pour vérifier le débit. Le PowerVault 110T LTO-2 et LTO-3 (version 53XX ou suivante du micro-code) comprend le mode de diagnostic guide d'utilisation du lecteur de bande pour plus de détails sur le mode de diagnostic "F". AVIS : pour le test du mode de diagnostic "F", vous devez utiliser un support - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 56
www.dell.com | support.dell.com Figure 1-1. Bande passante simple canal/double canal Unité vitesse de rotation est mesurée en rpm (tours par minute). Elle détermine le nombre de révolutions complètes effectuées par le disque dur en une minute. Ce paramètre affecte directement les temps de l'acc - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 57
celle-ci. Cependant, les données devant être lues à partir des disques, il est possible que les sauvegardes effectuées à partir de matrices externes dotées d'une mémoire cache subissent l'impact de ces restrictions. RAID 0 Le RAID 0, ou "striping" (étalement des données), permet d'associer deux ou - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 58
www.dell.com | support.dell.com La figure 1-2 montre quatre disques durs configurés en RAID 0. Les données sont réparties sur les quatre disques durs, ce qui permet de disposer - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 59
Cependant, la vérification ECC (vérification et correction d'erreurs) qui est effectuée lors de l'écriture sur les disques principal et miroir peut réduire les performances observées lors de la restauration de données à partir du lecteur de bande vers la matrice. Ce ralentissement est dû au fait que - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 60
www.dell.com | support.dell.com Plus la matrice contient de disques, plus les performances s'améliorent. Les matrices comprenant un grand nombre de disques peuvent afficher des performances de - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 61
En résumé, la configuration RAID 0 offre généralement les meilleures performances en lecture/ écriture, mais elle a pour défaut de n'offrir aucune fonction de redondance. Le niveau RAID 1 est le moins performant, car toutes les données écrites sur la matrice sont mises en miroir tandis que les - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 62
.dell.com | support.dell.com Configurations SAN La technologie Fibre Channel (FC) présente de nombreux avantages par rapport à l'interface SCSI. Elle est plus performante en termes de distance (12 mètres pour les périphériques SCSI à différentiel basse tension contre 300 mètres pour une liaison FC - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 63
Matrice de disques Fibre Channel Si un ralentissement du débit survient lors de la lecture des données à partir d'une matrice de disques FC externe, vous pouvez utiliser un logiciel de gestion des E-S tel qu'EMC® PowerPath® avec une connexion vers une structure supplémentaire pour équilibrer - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 64
www.dell.com | support.dell.com Figure 1-7. Ralentissement du débit des données/Matrice d'é qui ne sont pas disponibles dans la plupart des bibliothèques FC natives. Pour plus de détails sur ces fonctionnalités, consultez le guide d'utilisation du pont Fibre Channel de votre bibliothèque de - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 65
Configurations de câblage recommandées Câblage SCSI vers le système hôte Bibliothèque comportant un maximum de six lecteurs de bande Lorsque la bibliothèque de bandes est connectée à l'hôte via l'interface SCSI, chaque bus doit être connecté à un maximum de deux lecteurs. Des contrôleurs SCSI supplé - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 66
www.dell.com | support.dell.com Figure 1-9. Câblage SCSI pour une bibliothèque comportant un maximum de deux lecteurs de un maximum de six lecteurs avec un module de pont Fibre Channel pour optimiser les performances FC. 66 Remarques sur les performances des lecteurs et des bibliothèques de bandes - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 67
Figure 1-10. Câblage reliant un pont Fibre Channel à un lecteur de bande Interface SCSI de la bibliothèque SCSI 1 Terminaison Lecteur 1 Remarques sur les performances des lecteurs et des bibliothèques de bandes 67 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 68
www.dell.com | support.dell.com Figure 1-11. Câblage reliant un pont Fibre Channel à deux lecteurs de bande Interface SCSI de la bibliothèque SCSI 1 SCSI 2 Terminaison Lecteur 2 Terminaison Lecteur 1 68 Remarques sur les performances des lecteurs et des bibliothèques de bandes - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 69
Figure 1-12. Câblage reliant un pont Fibre Channel à trois lecteurs de bande Interface SCSI de la bibliothèque SCSI 1 SCSI 2 Terminaison Lecteur 3 Lecteur 2 Terminaison Lecteur 1 Remarques sur les performances des lecteurs et des bibliothèques de bandes 69 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 70
www.dell.com | support.dell.com Figure 1-13. Câblage reliant un pont Fibre Channel à quatre lecteurs de bande Interface SCSI de la bibliothèque SCSI 1 SCSI 2 Terminaison Lecteur 4 Lecteur 3 Terminaison - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 71
Figure 1-14. Paramètres de division en zones du canal pour une bibliothèque de bandes de un à quatre lecteurs Figure 1-15. Câblage reliant un pont Fibre Channel à cinq lecteurs de bande Interface SCSI de la bibliothèque Terminaison Lecteur 5 SCSI 3 SCSI 4 Lecteur 4 Terminaison Lecteur 3 Lecteur - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 72
www.dell.com | support.dell.com Figure 1-16. Câblage reliant un pont Fibre Channel à six lecteurs de bande Interface SCSI de la bibliothèque Terminaison Lecteur 6 Terminaison Lecteur 5 Lecteur 4 SCSI 3 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 73
une bibliothèque comportant un maximum de deux lecteurs de bande avec un module de pont Fibre Channel pour optimiser les performances FC. Figure 1-18. Bibliothèque de bandes comportant un lecteur Terminaison Figure 1-19. Bibliothèque de bandes comportant deux lecteurs Terminaison Terminaison - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 74
www.dell.com | support.dell.com 74 Remarques sur les performances des lecteurs et des bibliothèques de bandes - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 75
Dell™ PowerVault™-Systeme Hinweise zur Leistungsoptimierung bei Bandlaufwerken und Bandbibliotheken www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 76
Rechte vorbehalten. Die Reproduktion dieses Dokuments in jeglicher Form ohne schriftliche Genehmigung von Dell Inc. ist streng verboten. Marken in diesem Text: Dell, das DELL Logo und PowerVault sind Marken von Dell Inc.; EMC und PowerPath sind eingetragene Marken von EMC Corporation. Alle anderen - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 77
Inhalt Einführung 79 Allgemeine Datensicherungshinweise für Hostserver 79 Hinweise zu Bandlaufwerken und Daten 79 Konfiguration von Festplatten und RAID-Arrays 81 Allgemeine leistungsbezogene Hinweise zum Einsatz mehrerer Laufwerke in Bandbibliotheken 87 SCSI-Konfigurationen 87 SAN- - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 78
78 Inhalt - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 79
Einführung Angesichts der jüngsten Verbesserungen bei den Übertragungsraten für Bandlaufwerke müssen viele Faktoren auf der Hostseite - wie RAID-Konfigurationen und Festplattenspezifikationen - berücksichtigt werden, um zu ermitteln, ob Hostserver und Bandlaufwerk Daten mit der selben Ü - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 80
Firmware. Achten Sie darauf, dass für den SCSI- oder Fibre-Controller und das Bandlaufwerk immer die aktuellsten Treiber- und Firmwareversionen installiert sind. Unter support.dell.com können Sie die jeweils aktuellen Treiber- und Firmwareversionen für Ihr Dell PowerVault . Ein LTO-Bandmedium ist - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 81
So passt sich etwa das Bandlaufwerk Dell PowerVault 110T (LTO2 und LTO3) beim Beschreiben von LTO-3-Medien an Geschwindigkeiten bis hinunter zu 30 MB/s Wiederherstellung von Daten kann durch eine Reihe (interner und externer) Array-Attribute beeinträchtigt werden. In den nachstehenden - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 82
www.dell.com | support.dell.com Abbildung 1-1. Single-Channel- vs. Two-Channel-Bandbreite Gemeinsam genutzte bezieht sich auf die Anzahl der vollständigen Umdrehungen, die die Platte innerhalb einer Minute vollführt. Er wirkt sich direkt auf die Zugriffszeiten für die wahlfreie und die - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 83
eine Schreib-/ Lesegeschwindigkeit von 200 MB/s erreichen. Die Ultra160-Schnittstelle begrenzt die Maximalgeschwindigkeit des Arrays jedoch auf 160 MB/s. Externe Disk-Arrays, besonders in SANs, bieten unter Umständen umfassenden Cachespeicher, um die E/A-Leistung zu verbessern. Dies erhöht - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 84
www.dell.com | support.dell.com RAID 0 RAID 0 ist auch unter der Bezeichnung „Striping" bekannt. Dabei werden zwei oder mehr Festplatten zu einem virtuellen Laufwerk mit einer einzigen logischen Gerä - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 85
RAID 1 RAID 1 wird auch als „Mirroring" bezeichnet. Bei dieser Konfiguration werden dieselben Daten simultan auf zwei Laufwerke geschrieben. Beim Ausfall eines Laufwerks wechselt das System zum Zweitlaufwerk, ohne dass Daten verloren gehen. Bei Datensicherungen mit Bandlaufwerken entspricht die - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 86
www.dell.com | support.dell.com RAID 5 Bei einem RAID-5-Array werden Daten im Striping-Verfahren auf Byte-Ebene auf alle Festplatten im Array verteilt. Dies gilt auch für die Fehlerkorrektur- - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 87
Insgesamt ist RAID 0 tendenziell die beste Konfiguration für maximale Lese- und Schreibgeschwindigkeit, bietet jedoch keine Datenredundanz. RAID 1 weist generell die niedrigsten Übertragungsraten auf, weil alle auf das Array geschriebenen Daten gespiegelt und die Daten von einer einzigen Festplatte - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 88
www.dell.com | support.dell.com SAN-Konfigurationen Fibre-Channel (FC) bietet gegenüber SCSI zahlreiche Vorteile. Zum einen ist es nicht an die für SCSI geltenden Entfernungsbeschränkungen gebunden (LVD-SCSI: 12 m; 2-Gb-FC-Link: 300 m) und ermöglicht höhere Datenübertragungsgeschwindigkeiten. Zum - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 89
-Channel Switch Bandbibliothek Fibre-Channel Festplatten-Array Bandbibliothek Fibre-Channel Festplatten-Array Wenn beim Lesen der Daten von einem externen FC-Festplatten-Array ein Engpass auftritt, kann zudem durch den Einsatz einer E/A-Management-Software wie EMC® PowerPath® und die Verbindung - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 90
www.dell.com | support.dell.com Abbildung 1-7. Datenübertragungs-Engpass vs. Festplatten-Array mit an ein SAN anschließen. Das Modul dient als Überbrückung zwischen SCSI- und FC-Protokoll und bietet Zusatzfunktionen für Verwaltung, Sicherheit und Bedienung, die in den meisten nativen FCBibliotheken - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 91
Empfehlungen für die Kabelkonfiguration SCSI-Kabelverbindung zum Host Bandbibliothek mit bis zu sechs Bandlaufwerken Wenn die Bandbibliothek über SCSI an einen Host angeschossen ist, sollten maximal je zwei Laufwerke an einem Bus betrieben werden. Für Bandbibliotheken mit fünf oder sechs - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 92
www.dell.com | support.dell.com Datensicherungsanwendung aktivieren, können jedoch bei Bedarf die Überprüfungsleistung verbessern, indem sie die beiden Laufwerke auf zwei verschiedene SCSI-Busse aufteilen. Dies führt bei - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 93
mit bis zu sechs Laufwerken bei Einsatz eines Fibre-Channel-Brückenmoduls konfiguriert werden sollte, um die Bandleistung über FC zu optimieren. Abbildung 1-10. Kabelkonfiguration für Fibre-Channel-Brücke mit einem Bandlaufwerk SCSI-Schnittstelle der Bibliothek SCSI 1 Abschlusswiderstand Laufwerk - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 94
www.dell.com | support.dell.com Abbildung 1-11. Kabelkonfiguration für Fibre-Channel-Brücke mit zwei Bandlaufwerken SCSI-Schnittstelle der Bibliothek SCSI 1 SCSI 2 Abschlusswiderstand Laufwerk 2 Abschlusswiderstand Laufwerk 1 94 Hinweise zur Leistungsoptimierung - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 95
Abbildung 1-12. Kabelkonfiguration für Fibre-Channel-Brücke mit drei Bandlaufwerken SCSI-Schnittstelle der Bibliothek SCSI 1 SCSI 2 Abschlusswiderstand Laufwerk 3 Laufwerk 2 Abschlusswiderstand Laufwerk 1 Hinweise zur Leistungsoptimierung bei Bandlaufwerken und Bandbibliotheken 95 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 96
www.dell.com | support.dell.com Abbildung 1-13. Kabelkonfiguration für Fibre-Channel-Brücke mit vier Bandlaufwerken SCSI-Schnittstelle der Bibliothek Abschlusswiderstand Laufwerk 4 Laufwerk 3 SCSI 1 SCSI 2 Abschlusswiderstand Laufwerk 2 Laufwerk 1 Abbildung 1-14. - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 97
Abbildung 1-15. Kabelkonfiguration für Fibre-Channel-Brücke mit fünf Bandlaufwerken SCSI-Schnittstelle der Bibliothek Abschlusswiderstand Laufwerk 5 Laufwerk 4 SCSI 3 SCSI 4 Abschlusswiderstand Laufwerk 3 Laufwerk 2 SCSI 1 SCSI 2 Abschlusswiderstand Laufwerk 1 Hinweise zur - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 98
www.dell.com | support.dell.com Abbildung 1-16. Kabelkonfiguration für Fibre-Channel-Brücke mit sechs Bandlaufwerken Abschlusswiderstand Laufwerk 6 SCSI-Schnittstelle der Bibliothek Abschlusswiderstand Laufwerk 5 Laufwerk 4 SCSI 3 SCSI 4 Abschlusswiderstand Laufwerk 3 SCSI 1 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 99
zu zwei Laufwerken bei Einsatz eines Fibre-Channel-Brückenmoduls konfiguriert werden sollte, um die Bandleistung über FC zu optimieren. Abbildung 1-18. Bandbibliothek mit einem Laufwerk Abschlusswiderstand Abbildung 1-19. Bandbibliothek mit zwei Laufwerken Abschlusswiderstand Abschlusswiderstand - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 100
www.dell.com | support.dell.com 100 Hinweise zur Leistungsoptimierung bei Bandlaufwerken und Bandbibliotheken - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 101
Dell™ PowerVault www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 102
2005 Dell Inc Dell Inc Dell、DELL PowerVault は Dell Inc EMC および PowerPath は EMC Corporation Dell Inc 2005 年 6 月 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 103
目次 105 105 105 RAID 107 113 SCSI 113 SAN 114 目次 103 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 104
104 目次 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 105
はじめに RAID(Redundant Array of Inexpensive Independent] Disks SCSI SAN SCSI SCSI SCSI 80 MB 77 MB 64 Kb 64 Kb CPU 105 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 106
www.dell.com | support.dell.com SCSI support.dell.com Dell PowerVault HBA HBA HBA SCSI/RAID 1 RAID 1 RAID RAID LTO 75 LTO 2 分の 1 Dell PowerVault 110T(LTO2 および LTO3 LTO-3 30 MB 20 MB 20 MB 15 MB 106 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 107
PowerVault 110T LTO-2 および LTO-3 53XX F 6 F F RAID 異なる LUN OS LUN OS の LUN OS 1 OS 107 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 108
www.dell.com | support.dell.com 図 1-1 2 LUN OS 単一の LUN 別々の LUN OS の LUN LUN SCSI または RAID SCSI または RAID RPM(1 1 108 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 109
STR)。STR 1 STR STR RAID RAID の概要 RAID RAID RAID LUN RAID Ultra160 1 40 MB 5 台 の RAID 0 200 MB Ultra160 160 MB SAN I/O RAID RAID 109 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 110
www.dell.com | support.dell.com RAID 0 RAID 0 では、2 1 つの LUN 1 1 1 1 n n 図 1-2 は、RAID 0 構成の 4 4 4 図 1-2 RAID 0 1 D D1 2 D2 3 D3 4 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 SCSI または RAID 110 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 111
RAID 1 RAID 1 2 2 1 RAID 1 RAID 1 ECC CPU または RAID RAID 図 1-3 RAID 1 D M 1 D1 2 M1 D2 M2 D3 M3 D4 M4 D5 M5 SCSI または RAID 111 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 112
www.dell.com | support.dell.com RAID 5 RAID 5 RAID 5 RAID 0 RAID 5 図 1-4 RAID 5 1 P D P1 2 D1 3 D2 4 D3 D4 P2 D5 D6 D7 D8 P3 D9 D10 D11 D12 P4 D13 D14 D15 D16 SCSI または RAID 112 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 113
RAID 0 RAID 1 RAID 5 RAID RAID SCSI 構成 SCSI Ultra160 SCSI Ultra160 HBA SCSI HBA SCSI 160 MB SCSI Ultra160 160 MB 80 MB 160 MB SCSI 2 Ultra160 SCSI HBA Ultra320 HBA Ultra160 113 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 114
www.dell.com | support.dell.com SAN 構成 FC SCSI SCSI LVD SCSI では 12 m 2 Gb FC 300 m SCSI FC は SAN FC FC 1-5 図 1-5 2 Gb = 200 MB/ 秒 ホスト 受信 2 Gb = 200 MB/ 秒 送信 SAN FC SAN では FC FC 2 Gb FC 200 MB 200 MB 1 Gb 2 2 Gb 3 SAN 1-6 114 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 115
図 1-6 ホスト ホスト FC EMC® PowerPath I/O 1-7 SAN 2 I/O 2 115 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 116
www.dell.com | support.dell.com 図 1-7 ホスト ホスト 最後に、SAN 上の FC RAID SAN SAN 構成 SAN SCSI FC FC SCSI と FC 116 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 117
SCSI 6 SCSI 3 SCSI 5 6 SCSI 図 1-8 6 SCSI SCSI SCSI SCSI 2 2 SCSI SCSI バスに 2 2 117 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 118
www.dell.com | support.dell.com 2 2 つの SCSI 25 1-9 2 SCSI 図 1-10 から 1-17 6 118 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 119
図 1-10 1 SCSI SCSI 1 1 119 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 120
www.dell.com | support.dell.com 図 1-11 2 SCSI SCSI 1 SCSI 2 2 1 120 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 121
図 1-12 3 SCSI SCSI 1 SCSI 2 3 2 1 121 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 122
www.dell.com | support.dell.com 図 1-13 4 SCSI 4 3 SCSI 1 SCSI 2 2 1 図 1-14 1 台から 4 122 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 123
図 1-15 5 SCSI SCSI 3 SCSI 4 5 4 3 2 SCSI 1 SCSI 2 1 123 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 124
www.dell.com | support.dell.com 図 1-16 6 6 SCSI 5 4 SCSI 3 SCSI 4 3 SCSI 1 2 SCSI 2 1 図 1-17 5 6 124 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 125
図 1-18 と 図 1-19 2 図 1-18 1 図 1-19 2 125 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 126
www.dell.com | support.dell.com 126 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 127
Dell™ PowerVault www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 128
2005 Dell Inc. All rights reserved Dell Inc Dell, DELL 로고 및 PowerVault는 Dell Inc EMC 및 PowerPath는 EMC Corporation Dell Inc 2005 년 6 월 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 129
차례 131 131 131 RAID 132 138 SCSI 138 SAN 139 차례 129 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 130
130 차례 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 131
도입 RAID Fibre SCSI 및 SAN (Storage Area Network SCSI SCSI SCSI 80MB/sec 77MB/sec 64Kb 64Kb CPU SCSI support.dell.com Dell PowerVault 131 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 132
www.dell.com | support.dell.com HBA HBA HBA SCSI/RAID RAID RAID RAID LTO 75 LTO 1/2 back hitching Dell PowerVault 110T(LTO2 및 LTO3 LTO-3 30 MB/sec 20MB/sec 20MB/sec 15MB/sec PowerVault 110T LTO-2 및 LTO-3(펌웨어 53XX F 6 F F RAID 132 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 133
여러 LUN OS). OS LUN(Logical Unit Number LUN OS OS 그림 1-1 2 LUN OS LUN OS LUN 개별 LUN LUN SCSI 또는 RAID SCSI 또는 RAID RPM 133 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 134
www.dell.com | support.dell.com STR (Sequential/Sustained Transfer Rates STR STR STR RAID RAID RAID RAID LUN RAID Ultra160 40MB/sec 5 디스크 RAID 0 배열은 200MB/sec Ultra160 160 MB/sec SAN에서)은 I/O RAID RAID 134 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 135
RAID 0 RAID 0 LUN RAID 0 n n 그림 1-2는 4 RAID 0 4 4 그림 1-2. RAID 0 구성 예 이브 1 이브 2 D D1 D2 3 D3 4 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15 D16 D17 D18 D19 D20 SCSI 또는 RAID 135 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 136
www.dell.com | support.dell.com RAID 1 RAID 1 RAID 1 RAID 1 ECC CUP나 RAID RAID 그림 1-3. RAID 1 구성 예 이브 1 이브 2 D D1 M1 M D2 M2 D3 M3 D4 M4 D5 M5 SCSI 또는 RAID 136 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 137
RAID 5 RAID 5 RAID 5 RAID 0 RAID 5 그림 1-4. RAID 5 구성 예 P D 1 P1 2 D1 3 D2 4 D3 D4 P2 D5 D6 D7 D8 P3 D9 D10 D11 D12 P4 D13 D14 D15 D16 SCSI 또는 RAID 137 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 138
www.dell.com | support.dell.com RAID 0 RAID 1 RAID 5 RAID 5 RAID RAID SCSI 구성 SCSI Ultra160 SCSI Ultra160 HBA SCSI HBA SCSI 160MB/sec SCSI Ultra160 버스의 160MB/sec 80MB/sec 160MB/sec SCSI Ultra160 SCSI HBA Ultra160인 경우 Ultra320 HBA 138 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 139
SAN 구성 Fibre Channel(FC)은 SCSI FC는 SCSI LVD SCSI의 12미터 vs. 단파 2Gb FC 링크의 300 SCSI FC는 또한 SAN FC full-duplex FC 1-5 그림 1-5. Fibre Channel 호스트 2 Gb = 200 MB/sec 수신 전송 2 Gb = 200 MB/sec Fibre Channel 장치 SAN FC SAN에서 FC FC 2Gb FC 200MB/sec 200MB/sec 200MB/sec 1Gb 2 따라서 3 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 140
www.dell.com | support.dell.com 그림 1-6 호스트 Fibre Channel 스위치 Fibre Channel 스위치 Fibre Channel 스위치 Fibre Channel Fibre Channel FC EMC® PowerPath I/O 1-7 SAN I/O 140 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 141
Fibre Channel 스위치 Fibre Channel 스위치 Fibre Channel 스위치 Fibre Channel 스위치 Fibre Channel Fibre Channel SAN의 FC RAID SAN Fibre Channel SAN 구성 Fibre Channel SAN SCSI와 FC FC Fibre Channel Fibre Channel SCSI 및 FC Fibre Channel Fibre Channel Fibre Channel 141 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 142
www.dell.com | support.dell.com SCSI 6 SCSI SCSI 5개 또는 6 SCSI 그림 1-8. 최대 6 SCSI SCSI 케이블 SCSI 케이블 SCSI 케이블 최대 2 2 SCSI SCSI 2 2 2개의 SCSI 25 142 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 143
그림 1-9. 최대 2 SCSI Fibre Channel 1-10부터 1-17까지는 FC 6 Fibre Channel 143 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 144
www.dell.com | support.dell.com 그림 1-10. Fibre Channel SCSI SCSI 1 1 144 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 145
그림 1-11. Fibre Channel 2 SCSI SCSI 1 SCSI 2 2 1 145 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 146
www.dell.com | support.dell.com 그림 1-12. Fibre Channel 3 SCSI SCSI 1 SCSI 2 3 2 1 146 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 147
그림 1-13. Fibre Channel 4 SCSI 4 3 SCSI 1 SCSI 2 2 1 그림 1-14. 1 ~ 4 Channel Zoning 설정 147 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 148
www.dell.com | support.dell.com 그림 1-15. Fibre Channel 5 SCSI SCSI 3 SCSI 4 SCSI 1 SCSI 2 5 4 3 2 1 148 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 149
그림 1-16. Fibre Channel 6 SCSI SCSI 3 6 5 4 SCSI 4 3 SCSI 1 2 SCSI 2 1 그림 1-17. 5 개 또는 6 Channel Zoning 설정 149 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 150
www.dell.com | support.dell.com 그림 1-18 및 1-19는 FC 2 Fibre Channel 그림 1-18 그림 1-19. 2 150 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 151
Sistemas Dell™ PowerVault™ Consideraciones sobre el rendimiento de las unidades de cinta y las bibliotecas de cintas www.dell.com | support.dell.com - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 152
reproducción de este documento en cualquier forma sin la autorización por escrito de Dell Inc. Marcas comerciales utilizadas en este texto: Dell, el logotipo de DELL y PowerVault son marcas comerciales de Dell Inc.; EMC y PowerPath son marcas comerciales registradas de EMC Corporation. Otras marcas - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 153
Índice Introducción 155 Consideraciones generales sobre la copia de seguridad en el host 155 Consideraciones sobre la unidad de cinta y los datos 155 Configuración de la unidad de disco duro y la matriz RAID 157 Consideraciones generales sobre el rendimiento al utilizar varias unidades en - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 154
154 Índice - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 155
Introducción Con la reciente introducción de mejoras en la velocidad de transferencia de las unidades de cinta, ahora es importante tener en cuenta algunos factores del lado del host, como la configuración RAID (matriz redundante de discos independientes [o económicos]) y las especificaciones de las - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 156
firmware más recientes. Vaya a support.dell.com para descargar los controladores y el firmware más recientes para su producto de cinta Dell PowerVault provocar tasas de errores puede elevadas y la LTO es de 75 lecturas/escrituras completas de cinta. Coincidencia de velocidad. Las nuevas unidades LTO - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 157
La unidad PowerVault 110T LTO-2 y LTO-3 (firmware 53XX o error. Consulte el Manual del usuario de la unidad de cinta para obtener detalles específicos sobre el modo de diagnóstico "F". AVISO: el modo de diagnóstico "F" requiere utilizar soportes que puedan sobrescribirse de forma segura como parte - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 158
www.dell.com | support.dell.com Figura 1-1. Amplitud de banda de un canal frente a dos canales LUN compartido único LUN único con datos de copia de seguridad y SO LUN distintos - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 159
y grabando. La desfragmentación de una unidad de disco duro puede ayudar a que la unidad alcance su STR máxima. Búfer (caché). El búfer es la parte de la memoria de la unidad que contiene los datos que se han grabado o almacenado más recientemente. Cuanto mayor sea el búfer, más datos podrá contener - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 160
www.dell.com | support.dell.com RAID 0 RAID 0, conocida también como configuración por bandas, permite que dos o varios discos se unan para crear una unidad virtual al estilo de una ú - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 161
de la restauración desde la unidad de cinta que graba en la matriz RAID 1 puede ser más lento debido a la verificación y corrección de errores (ECC) que se realiza al grabar en los discos principales y duplicados. Esta ineficiencia se debe en gran medida a que la duplicación suele llevarse - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 162
www.dell.com | support.dell.com Figura 1-3. Ejemplo de configuración RAID 1 Unidad de Unidad de disco duro 1 por bandas en la matriz de discos en el nivel de byte y los datos de corrección de errores, o datos de paridad, también se configuran por bandas en la matriz de discos. Las matrices RAID - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 163
Las restauraciones de una cinta a una matriz RAID 5 tienden a ser nominales, porque implican una sobrecarga adicional para calcular y grabar la información de paridad. Figura 1-4. Ejemplo de configuración RAID 5 Unidad de Unidad de Unidad de Unidad de disco duro 1 disco duro 2 disco duro 3 disco - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 164
www.dell.com | support.dell.com Las operaciones de copia de seguridad seguirán estando sujetas a las limitaciones de la configuración RAID. Además, las características de la matriz seguirán dependiendo - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 165
significa que los datos pueden transmitirse en dos direcciones simultáneamente. Por lo tanto, durante una operación de copia de seguridad en una sola conexión FC, los datos pueden leerse de un origen y grabarse en una cinta sin tener que realizar la comunicación por turnos, lo que permite doblar la - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 166
dell.com | support.dell en los datos que se están leyendo de una matriz de discos FC externa, la utilización de software de administración de E/S, como por aumentará la disponibilidad mediante la sustitución tras error. Consulte la figura 1-7. En la parte izquierda de la figura se muestra una matriz - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 167
de cinta. Esto se debe a que la capacidad de procesamiento del módulo de puente Fibre Channel que se requiere para conectar las comunicaciones SCSI y FC no puede satisfacer la velocidad de datos agregados que ofrecen algunas configuraciones con varias unidades. A pesar de ello, en la mayoría de las - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 168
www.dell.com | support.dell.com Configuraciones de cableado recomendadas Cableado SCSI al host Biblioteca de cintas con hasta seis unidades de cinta Si la biblioteca de cintas está conectada - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 169
Biblioteca de cintas con hasta dos unidades de cinta Las unidades de una biblioteca de cintas con dos unidades completamente configurada pueden cablearse a un host del mismo bus SCSI sin que el rendimiento de la copia de seguridad encuentre limitaciones importantes. La velocidad de copia de - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 170
www.dell.com | support.dell.com Cableado de las unidades al puente Fibre Channel En las figuras de la 1-10 a la 1-17 se muestra cómo debe configurarse una biblioteca de cintas con hasta seis unidades de cinta y un módulo de puente Fibre Channel para optimizar el rendimiento de la cinta en FC. - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 171
Figura 1-11. Cableado del puente Fibre Channel con dos unidades de cinta Interfaz SCSI de biblioteca SCSI 1 SCSI 2 Terminador Unidad 2 Terminador Unidad 1 Consideraciones sobre el rendimiento de las unidades de cinta y las bibliotecas de cintas 171 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 172
www.dell.com | support.dell.com Figura 1-12. Cableado del puente Fibre Channel con tres unidades de cinta Interfaz SCSI de biblioteca SCSI 1 SCSI 2 Terminador Unidad 3 Unidad 2 Terminador Unidad 1 172 Consideraciones sobre el rendimiento de las unidades de cinta y las bibliotecas de cintas - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 173
Figura 1-13. Cableado del puente Fibre Channel con cuatro unidades de cinta Interfaz SCSI de biblioteca SCSI 1 SCSI 2 Terminador Unidad 4 Unidad 3 Terminador Unidad 2 Unidad 1 Consideraciones sobre el rendimiento de las unidades de cinta y las bibliotecas de cintas 173 - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 174
www.dell.com | support.dell.com Figura 1-14. Configuración de la agrupación por zonas Fibre Channel para una biblioteca de cintas con entre una y cinco unidades Figura 1-15. Cableado del - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 175
Figura 1-16. Cableado del puente Fibre Channel con seis unidades de cinta Interfaz SCSI de biblioteca Terminador Unidad 6 Terminador Unidad 5 Unidad 4 SCSI 3 SCSI 4 Terminador Unidad 3 SCSI 1 Unidad 2 SCSI 2 Terminador Unidad 1 Figura 1-17. Configuración de la agrupación por zonas Fibre - Dell PowerVault LTO4-120 | Performance Considerations for Tape Drives and Librar - Page 176
www.dell.com | support.dell.com En las figuras 1-18 y 1-19 se muestra cómo debe configurarse una biblioteca de cintas con entre una y dos unidades de cinta y un módulo de puente Fibre Channel para optimizar el rendimiento de la cinta en FC. Figura 1-18. Biblioteca de cintas con una unidad
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Dell™ PowerVault™ Systems
Performance Considerations
for Tape Drives and Libraries