HP StorageWorks TL895 Adding the TL895 to the Enterprise Backup Solution - Page 33

Sizing the EBS, Speed Tests, Compression Tests

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Performance and Sizing 33 Sizing the Enterprise Backup Solution Speed Tests Determining the speed of Backup and Restore processes in a real-world environment is the most important factor in designing and implementing the Compaq StorageWorks EBS. Fibre Channel is designed to produce a theoretical maximum of 1.0625 Gigabits per hour. This equates to 100 Megabytes per second or 360 Gigabytes per hour. (Test results are expressed in GB/H for clarity). IMPORTANT: A single DLT 7000 drive is rated at a theoretical maximum of 18 GB/H. To determine the approximate speed of backup and restore jobs in an EBS environment, Compaq began testing non-compressible (1:1) data. IMPORTANT: Compaq tested both the Seagate Backup Exec and Computer Associates (CA) ARCserveIT in an EBS environment to benchmark the DLT performance. Both Seagate and CA generated consistent throughput of approximately 15 GB/H. Tests were performed with each job configured to write to a single DLT drive. Tests show nearlinear scalability. The TL895 supports seven DLT 7000 tape drives. Gigabytes Per Hour 1:1 Backup & Restore 120 100 80 60 40 20 00 0 Backup Restore 109.16 59.70 58.14 74.25 69.87 89.49 80.36 44.77 44.88 29.93 29.97 14.87 14.76 90.15 1 2 3 4 5 6 7 Number of DLT Drives Figure 4-1. Test Results of Backup and Restore Jobs. Compression Tests IMPORTANT: The amount of compression has a direct impact on the rate that a DLT 7000 tape drive can write data.

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Performance and Sizing
33
Sizing the Enterprise Backup Solution
Speed Tests
Determining the speed of Backup and Restore processes in a real-world environment is the most
important factor in designing and implementing the Compaq StorageWorks EBS. Fibre Channel
is designed to produce a theoretical maximum of 1.0625 Gigabits per hour. This equates to
100 Megabytes per second or 360 Gigabytes per hour. (Test results are expressed in GB/H for
clarity).
IMPORTANT:
A single DLT 7000 drive is rated at a theoretical maximum of 18 GB/H.
To determine the approximate speed of backup and restore jobs in an EBS environment,
Compaq began testing non-compressible (1:1) data.
IMPORTANT:
Compaq tested both the Seagate Backup Exec and Computer Associates (CA)
ARCserveIT in an EBS environment to benchmark the DLT performance. Both Seagate and CA
generated consistent throughput of approximately 15 GB/H.
Tests were performed with each job configured to write to a single DLT drive. Tests show near-
linear scalability. The TL895 supports seven DLT 7000 tape drives.
1:1 Backup & Restore
0
14.87
29.93
44.77
59.70
74.25
89.49
109.16
0
14.76
29.97
44.88
58.14
69.87
80.36
90.15
0
20
40
60
80
100
120
1
2
3
4
5
6
7
Number of DLT Drives
Gigabytes Per Hour
Backup
Restore
Figure 4-1.
Test Results of Backup and Restore Jobs.
Compression Tests
IMPORTANT:
The amount of compression has a direct impact on the rate that a DLT 7000 tape
drive can write data
.
T
ests showed the number of DLT drives and compression scaled near 1:1, but the total rate of