Compaq ProLiant 6000 Compaq DLT Tape Array II: High-Performance Backup of Ente - Page 8

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ECG075.0997 (cont.) DLT Tape Array II ... TEST 1 TAPE DRIVES IN RELATION TO SCSI CARDS  WINDOWS NT Windows NT 4.0 Cheyenne ARCserve 6.0 for Windows NT Image and by file 2 GB 4:1 RAIT-0 ProLiant 5000, two Pentium Pro 200 processors, 256K cache, 256 MB RAM 80-GB array (two SMART-2/P Array Controllers with twenty 4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To observe the performance of various numbers of tape drives in relation to various numbers of SCSI cards under Windows NT 4.0. Of the configurations tested, two SCSI cards driving two 35/70 GB DLT drives offer the fastest speed. Although a typical configuration (two SCSI cards driving four 35/70 GB DLT drives) tested two percent slower, it doubles the capacity of the backup, and is therefore recommended to avoid tape changes during the backup of large data sets. Tape change delays might easily offset any performance advantage of using the smaller two-drive configuration. There is no benefit to using a separate SCSI card for each drive when using the Wide-Ultra SCSI Controller (part number 272514-001). The bandwidth of this card can easily drive two 35/70 GB DLT drives. On a system with only Fast-Wide SCSI Controllers (part number 199533-001), splitting the four drives among four cards will help somewhat. It is also evident that image backups are considerably faster in a multi-drive configuration. The ProLiant 5000 uses the slower Fast/Wide technology on its single embedded SCSI controller. It is recommended that this be used only for slower devices, not for multiple tape drives. The ProLiant 6000 has two embedded Wide-Ultra SCSI Controllers, of which the Bport is available for use with externally mounted tape devices. The A port can also be used; however, an optional cable is required.

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(cont.)
DLT Tape Array II
ECG075.0997
T
EST
1
T
APE
D
RIVES IN
R
ELATION TO
SCSI C
ARDS
W
INDOWS
NT
Windows NT 4.0
Cheyenne ARCserve 6.0 for Windows NT
Image and by file
2 GB
4:1
RAIT-0
ProLiant 5000, two Pentium Pro 200 processors, 256K
cache, 256 MB RAM
80-GB array (two SMART-2/P Array Controllers
with twenty 4-GB drives)
35/70 GB DLT drive(s)
Wide-Ultra SCSI-3 cards
(All Compaq off-the-shelf products)
To observe the performance of various numbers of tape drives in relation to various numbers of
SCSI cards under Windows NT 4.0.
Of the configurations tested, two SCSI cards driving two 35/70 GB DLT drives offer the fastest
speed. Although a typical configuration (two SCSI cards driving four 35/70 GB DLT drives)
tested two percent slower, it doubles the capacity of the backup, and is therefore recommended
to avoid tape changes during the backup of large data sets. Tape change delays might easily
offset any performance advantage of using the smaller two-drive configuration.
There is no benefit to using a separate SCSI card for each drive when using the Wide-Ultra
SCSI Controller (part number 272514-001). The bandwidth of this card can easily drive two
35/70 GB DLT drives. On a system with only Fast-Wide SCSI Controllers (part number
199533-001), splitting the four drives among four cards will help somewhat. It is also evident
that image backups are considerably faster in a multi-drive configuration.
The ProLiant 5000 uses the slower Fast/Wide technology on its single embedded SCSI
controller. It is recommended that this be used only for slower devices, not for multiple tape
drives. The ProLiant 6000 has two embedded Wide-Ultra SCSI Controllers, of which the B-
port is available for use with externally mounted tape devices. The A port can also be used;
however, an optional cable is required.
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