Compaq ProLiant 6000 Compaq DLT Tape Array II: High-Performance Backup of Ente - Page 14

Ackup Of, Indows, Arious, Umbers Of, Rives

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ECG075.0997 (cont.) DLT Tape Array II ... TEST 4 LOCAL BACKUP OF WINDOWS NT TO VARIOUS NUMBERS OF DLT DRIVES Windows NT 4.0 Cheyenne ARCserve 6.0 for Windows NT Image 2 GB 2:1 RAIT-0 ProLiant 5000, two Pentium Pro 200 processors, 256K cache, 256 MB RAM 40-GB array (one SMART-2/P Array Controller with ten 4-GB drives) 35/70 GB DLT drive(s) Wide-Ultra SCSI-3 cards (All Compaq off-the-shelf products) To determine the highest performance configuration for an image backup to DLT drive or RAIT-0 group of drives (RAIT-0 is not significant when using one drive). The test consisted of running a single job to back up a 2 GB file set to various numbers of DLT drives (from one to eight). Results show a limit of about 40 GB/hr while running a single job. Other tests with faster feed sources show an upper limit of 57 GB/hr for a single job writing to eight tape drives. This limit is based on the limit to the number of threads that a backup program can run under Windows NT. Additional tests will be run to show that if multiple jobs are run simultaneously, there is still available bandwidth from the disk drives, the CPU, the operating system, and the tape drives to permit a much higher aggregate speed. In this configuration, the restore speed exceeded the backup speed in some cases, apparently because the SMART-2/P Array Controllers cache much of the data, making the restore data flow more consistently to the target.

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(cont.)
DLT Tape Array II
ECG075.0997
T
EST
4
L
OCAL
B
ACKUP OF
W
INDOWS
NT
TO
V
ARIOUS
N
UMBERS OF
DLT D
RIVES
Windows NT 4.0
Cheyenne ARCserve 6.0 for Windows NT
Image
2 GB
2:1
RAIT-0
ProLiant 5000, two Pentium Pro 200 processors, 256K
cache, 256 MB RAM
40-GB array (one SMART-2/P Array Controller
with ten 4-GB drives)
35/70 GB DLT drive(s)
Wide-Ultra SCSI-3 cards
(All Compaq off-the-shelf products)
To determine the highest performance configuration for an image backup to DLT drive or
RAIT-0 group of drives (RAIT-0 is not significant when using one drive). The test consisted of
running a single job to back up a 2 GB file set to various numbers of DLT drives (from one to
eight).
Results show a limit of about 40 GB/hr while running a single job. Other tests with faster feed
sources show an upper limit of 57 GB/hr for a single job writing to eight tape drives. This limit
is based on the limit to the number of threads that a backup program can run under Windows
NT. Additional tests will be run to show that if multiple jobs are run simultaneously, there is
still available bandwidth from the disk drives, the CPU, the operating system, and the tape
drives to permit a much higher aggregate speed.
In this configuration, the restore speed exceeded the backup speed in some cases, apparently
because the SMART-2/P Array Controllers cache much of the data, making the restore data
flow more consistently to the target.
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