HP StoreOnce D2D4106i HP D2D Backup System Concepts guide (EH985-90915, March
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- HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 1
the HP StoreOnce Backup System, it is a good idea to read this guide before you configure your system. It describes the StoreOnce technology and advises how to plan the workload being placed on the HP StoreOnce Backup System in order to optimize performance and minimize the impact of deduplication - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 2
to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 3
number of files per NAS share and appliance 13 Maximum number of users per CIFS share 14 Maximum number of hosts per NFS share (G2 products only 14 4 Data deduplication 15 What is data deduplication?...15 Data deduplication and the HP StoreOnce Backup System 15 Tape rotation example with data - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 4
peformance...35 Balancing performance and deduplication ratios 35 To be avoided guide 48 Intended audience...48 Related documentation...48 Document conventions and symbols 48 HP technical support...49 Customer self repair...49 Registering your HP D2D Backup System 49 Subscription service...49 HP - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 5
an HP D2D Backup System is split between VTL and NAS devices and varies according to model. These devices may be all VTL, all NAS or any combination of NAS and VTL devices. All HP StoreOnce devices automatically make use of StoreOnce deduplication, ensuring efficient and cost-effective use of disk - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 6
chapters in this guide provide more background information about VTL and NAS devices and the specifications that are supported. For information about using the Web Management Interface to configure and monitor devices, refer to the HP StoreOnce D2D Backup System user guide. 6 Before you start - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 7
, but physically, they use disk space on the HP StoreOnce Backup System which, as in tape terminology, is referred to as slots or cartridges. Each storage slot contains a cartridge. The difference between an autoloader and a library is that a library can support multiple tape drives whereas an - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 8
are created from the Virtual Tape Devices - Devices page of the Web Management Interface, which is also used to configure devices and slots. When you configure your HP StoreOnce Backup System with a tape library, the drive emulation type that you select determines the default cartridge size for each - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 9
per 48 library (D2DBS) HP D2D2503i 6 1 48 HP D2D2504i 8 4 HP D2D4004 /4009 16 4 48 96 HP D2D4112 24 4 144 NOTE: It is only possible to exceed the maximum physical limitation when configuring the HP D2D4112 Backup System. Flexible emulation (G2 products only) If supported, the ESL, EML and - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 10
as VTL devices, you will not be able to configure any NAS shares for that appliance. • Please refer to the D2D Best Practices for VTL, NAS and Replication implementations for maximum and recommended values. NOTE: G1 products do not support flexible emulation; they have fixed values for the above - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 11
is working correctly and check the integrity of the replicated backup by doing a test restore • To perform manual tape copy jobs to a tape device on the network using the backup application See the HP StoreOnce D2D Backup System user guide for more information about using this feature. VTL devices - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 12
. Splitting disk and tape targets into separate zones will help to keep the HP StoreOnce Backup System free from discovering disk controllers which it doesn't need to see. For optimal performance, where practical, dedicate HBAs for disk and tape. NOTE: Overlapping zones are supported. 12 Virtual - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 13
and UNIX networks NOTE: G1 HP D2D Backup Systems support only the CIFS interface for Windows networks. See the HP StoreOnce Backup System user guide for more information about using the Web Management Interface to create and configure NAS shares as targets for backup applications. Refer to the UNIX - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 14
. So, there is also a maximum number of open files that are the same size or smaller than the deduplication threshold that are allowed per appliance. Across the whole HP StoreOnce Backup System the number of simultaneously open files is as follows: Table 4 Maximum number of files G2 products - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 15
housekeeping. Without them, data cannot be restored successfully. Data deduplication and the HP StoreOnce Backup System Data deduplication is applied per library device or share. When you configure the library or share, it defaults to deduplication enabled. It cannot be disabled on any G2 product - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 16
Benefits of HP D2D deduplication The main Deduplication: • Provides efficient use of storage capacity by eliminating duplicate data • Reduces disk expenditures by reducing storage space required. You can get more backups for each host on the same size of storage (HP StoreOnce device) • Prolongs disk - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 17
Table 6 Data deduplication savings, example 1 1st daily full backup 1st daily incremental backup 2nd daily incremental backup 3rd daily incremental backup 4th daily incremental backup 5th daily incremental backup 2nd weekly full backup 3rd weekly full backup 25th weekly full backup TOTAL Data - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 18
take you through HP D2D Replication configuration steps. Replication and NAS Shares HP D2D Replication allows NAS shares that have been configured on one HP StoreOnce Backup System (the Source Appliance) to be replicated to corresponding NAS shares on another HP StoreOnce Backup System (the Target - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 19
Source Appliances. However, it is possible to lock down the ability to create share and library mappings so that, when the wizard is run and mappings are configured, the Target only has access to a list of sources that are allowed to replicate to it. See the HP StoreOnce Backup System user guide for - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 20
of the NAS share or library on the source HP StoreOnce Backup System. This appliance needs a replication license. • Non-Replicating Device: This describes a NAS share or library on a StoreOnce Backup System that has not been configured as a source or target for replication. • Replication-Source - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 21
OUT, FAN IN and Concurrency. Fan OUT When we talk about FAN OUT, we are considering the number of replication Target Appliances that are supported from that Source Appliance (the HP StoreOnce Backup System that contains the shares and libraries that you wish to replicate). Each share on the Source - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 22
can replicate to up to two Target Appliances. Figure 7 HP D2D 2500 Fan OUT example Of course, the above is for illustration only. If your Company policy does not dictate geographically unique data centers, there's no reason why you could not support all four libraries or shares on a single Target - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 23
and 4300 Series would be able to support all 20 NAS shares, because of the one-to-one mapping. • Remote Site 1 and Remote Site 4 each have one D2D Appliance and are running 4 projects. They have configured a Source Library for each project on their HP D2D. Each set of 4 libraries can be mapped - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 24
from those libraries into a single HP D2D 4xxx series Target Library. • Remote Site 5 has four D2D Appliances, each with one Source Library. backups and daily incremental backups, you may decide to only replicate the slots that contain the full backups. You make this selection when you configure - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 25
appliance HP D2D 4106/4112 4 D2D4106: 16 D2D4112: 24 1 8 8 24 HP D2D 4312/4324 8 50 1 16 16 48 Table 8 Fan In, Fan Out and job concurrency rules, G1 products Appliance Fan Out Appliance Fan In Library Fan Out Library Fan In Maximum number of Target appliances supported by one Source appliance - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 26
been configured on it are being replicated to matching shares and libraries on the HP StoreOnce Backup System in Office B. A replication license is required only for the HP StoreOnce Backup System in Office B. That license covers all Replication-Target shares and libraries on Appliance B. Figure - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 27
offices. A replication license is required only for the HP StoreOnce Backup System in the Data Center. That license covers all Replication-Target libraries and shares. This is also a good example of slot mapping. Library 2 on the Target Appliance is being used as a Replication-Target Library by - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 28
Target. If you wish to replicate data to multiple HP StoreOnce Backup Systems, you require a separate license for each target appliance, appropriate to the model type, and must repeat the activation process for each HP StoreOnce Backup System. NOTE: The Replication license can only be used on - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 29
tab on the Web Management Interface. See the HP StoreOnce Backup System user guide for information about using the Replication wizard to configure mappings to virtual tape devices and NAS shares. Seeding the Replication Target Appliance Data deduplication ensures that the amount of data to be - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 30
mapped to and the files from the USB disk copied into that share. 6. Normal replication HP StoreOnce Backup Systems. If necessary and the D2Ds conflict with another device on the network, these ports can be changed from the defaults when you create the replication pairing or from the Local Appliance - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 31
are lost and both are replaced, the Recovery wizard can be used to repopulate a replacement source appliance. NOTE: This option can use reverse seeding to speed up data recovery to the D2D. This would be a USB disk if you are recovering to a NAS share. 2. Target Promotion Figure 15 • The target is - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 32
: This configuration is possible in only limited situations because it will break any other backups or replications to the Data Center appliance. In a simple Active-Passive scenario, however, this may be a very good model. IMPORTANT: If you replace the disks in the source D2D appliance and keep - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 33
data is deleted from the D2D system (e.g a virtual cartridge is HP D2D4106 appliance would need approximately 30 minutes of quiescent time over the course of the next 24 hours to run housekeeping in order to de-reference data and reclaim any free space. What do I need to do? Configuring backup - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 34
. See the HP StoreOnce Backup System user guide for details. For more information This is a complex subject. We strongly recommend that you read HP D2D Backup Systems best practices for VTL, NAS and Replication implementations that is available on http:www.hp.com/ support/manuals for more detailed - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 35
recommend that you read HP D2D Backup Systems best practices for VTL, NAS and Replication implementations that is available on http:www.hp.com/support/ manuals for more detailed guidance. StoreOnce key processes Key processes are: • Backup with deduplication • Replication • Housekeeping By default - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 36
24 streams to 24 separate libraries provides the best performance. • Writing 24 streams to 24 drives on a single library provides the best deduplication ratio. To be avoided • Do not delete and eject cartridges • Avoid housekeeping jobs during backup • Avoid running a lot of small incremental - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 37
is a protocol for interfacing to hosts on a Windows network. The HP StoreOnce Backup System supports this interface for connecting to NAS targets from a Windows network. Data deduplication compares blocks of data being written to the backup device with data blocks previously stored on the device. If - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 38
slot when the user runs an Import job. Mail slots have no practical usage with G2 HP StoreOnce Backup Systems because direct export to tape is not supported. N NAS Shares Devices on HP StoreOnce Backup Systems may be configured as Virtual Tape devices or as NAS (Network Attached Storage) targets - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 39
same system. Once configured (using the simple-to-use wizard), replication occurs automatically, ensuring data is mirrored from the source to the target HP StoreOnce Backup Systems. Deduplication ensures that network traffic is minimized. See also the HP StoreOnce Backup System Concepts Guide. The - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 40
Guide for example configurations. Virtual Tape Devices are backup targets on the HP StoreOnce Backup System to which the backup application on the hosts write data. They appear to the host as network-attached or locally-attached physical tape library or autoloader, but physically, they use disk - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 41
create and run manual and scheduled jobs. NOTE: Physical tape storage devices attached to the HP D2D Backup System can only be accessed by the HP D2D Backup System using the Tape Attach pages. They do not appear as attached network devices to the host system. • Attach a supported tape storage device - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 42
up some disk space. Export (and Import) require additional steps in the backup application. Cartridge copy The backup application on the host is used to back up data to a cartridge on the library device in the HP D2D Backup System. The Web Management Interface on the HP D2D Backup System is used - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 43
data and frees up disk space on the HP D2D Backup System and is useful for long term archival (for example in a yearly tape in a rotation scheme). If restore is needed, data can be imported (or moved back) into the HP D2D Backup System. Export is not recommended with deduplicating libraries as it - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 44
overwrite it without explicitly asking for the cartridge to be moved back into the library. The main advantage of Export is that it frees up disk space on the HP D2D Backup System if deduplication is disabled on the library device. However, care must be taken to ensure that future - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 45
, once software compression has been applied, the data is not further compressed when it is exported to a physical tape directly attached to the HP D2D Backup System. This ensures that the user knows exactly how much physical cartridge space is required for export or copy. Cartridge import The Web - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 46
single cartridge in the HP D2D Backup System is not supported. The data from the cartridge on the HP D2D Backup System must not exceed the which contains the full backup, onto the Target Appliance without placing any load on network bandwidth. (Deduplication ensures that subsequent replication - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 47
new server hardware has been purchased and installed the administrator is able to recover the server data using tape before purchasing and re-installing a new D2D device in the remote office. This procedure only applies if a tape library or tape drive is physically attached to the Data Center - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 48
about: • Installing the HP StoreOnce D2D Backup System • Using the HP StoreOnce D2D Backup System • Troubleshooting the HP StoreOnce D2D Backup System Intended audience This guide is intended for users who install, operate and maintain the HP StoreOnce D2D Backup System. Related documentation In - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 49
CSR. For more information about CSR, contact your local service provider. For North America, see the CSR website: http://www.hp.com/go/selfrepair Registering your HP D2D Backup System Once you have installed and tested your HP D2D Backup System please take a few minutes to register your product. You - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 50
, see the following HP websites: • http://www.hp.com • http://www.hp.com/go/ebs • http://www.hp.com/go/connect • http://www.hp.com/go/storage • http://www.hp.com/service_locator • http://www.hp.com/support/manuals • http://www.hp.com/support/downloads Documentation feedback HP welcomes your feedback - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 51
D2D Backup System, 42 audience, 48 B backup targets, 5 C capacity license, 28 cartridge copy, 42 export, import, 43, 45 CIFS, 13 CIFS share maximum users, 14 comparing NAS and VTL, 6 compression, 45 deduplication, 16 connecting to the appliance housekeeping, 33 HP technical support, 49 HP 1x8 G2 - HP StoreOnce D2D4106i | HP D2D Backup System Concepts guide (EH985-90915, March - Page 52
, 46 StoreOnce Backup System definition, 5 StoreOnce key processes, 35 Subscriber's Choice, HP, 49 symbols in text, 49 T tape attach modes of operation, 42 tape rotation example, 16 tape spanning, 46 target appliance, 20 target libraries making visible, 11 technical support HP, 49 service locator
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HP StoreOnce
Backup System Concepts Guide
Abstract
If you are new to the HP StoreOnce Backup System, it is a good idea to read this guide before you configure your system. It
describes the StoreOnce technology and advises how to plan the workload being placed on the HP StoreOnce Backup System
in order to optimize performance and minimize the impact of deduplication, replication and housekeeping operations competing
for resources.
IMPORTANT:
The localized versions of this guide have been produced prior to launch. The English version that is available
on the web at launch may have later updates. Always check
h
t
tp://w
w
w
.hp
.co
m/su
ppo
r
t/man
uals
for the most up-to-date
documentation for your product.
HP Part Number: EH985-90915
Published: February 2011
Edition: 1