Compaq ProLiant 6000 Compaq DLT Tape Array II: High-Performance Backup of Ente - Page 11

cont., DLT Tape Array II

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ECG075.0997 (cont.) DLT Tape Array II ... 160 140 GB/hr 120 100 80 60 40 20 0 Backup Restore Figure 7: Performance of IntranetWare backups and restores by numbers of SCSI cards in relation to numbers of tape drives (shown at the bases of the columns). 1 to 1 1 to 2 2 to 3 2 to 4 3 to 5 3 to 6 4 to 7 4 to 8 1 1 31.61 31.32 1 2 61.94 53.38 2 3 92.61 79.12 2 4 121.78 58.42 3 5 126.59 59.69 3 6 144.36 60.57 4 7 146.57 61.28 4 8 151.58 56.52 Table 2: Test data for numbers of tape drives in relation to numbers of SCSI cards under Novell IntranetWare. The relationship between backup and restore speeds is inconsistent for a variety of reasons. Restore speed varies with the compression of the files. Compression and decompression times vary with file content and have different effects on CPU use. Another influence on restore speed is the rate at which the target can receive and write data. The use of large, multi-megabyte caches on disk drive arrays occasionally allows restore speeds to exceed backup speeds.

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7
%
(cont.)
DLT Tape Array II
ECG075.0997
0
20
40
60
80
100
120
140
160
1 to 1
1 to 2
2 to 3
2 to 4
3 to 5
3 to 6
4 to 7
4 to 8
Backup
Restore
GB/hr
Figure 7: Performance of IntranetWare backups and restores by numbers of SCSI cards in relation to
numbers of tape drives (shown at the bases of the columns).
1
1
31.61
31.32
1
2
61.94
53.38
2
3
92.61
79.12
2
4
121.78
58.42
3
5
126.59
59.69
3
6
144.36
60.57
4
7
146.57
61.28
4
8
151.58
56.52
Table 2: Test data for numbers of tape drives in relation to numbers of SCSI cards
under Novell IntranetWare.
The relationship between backup and restore speeds is inconsistent for a variety of reasons.
Restore speed varies with the compression of the files. Compression and decompression times
vary with file content and have different effects on CPU use.
Another influence on restore speed is the rate at which the target can receive and write data.
The use of large, multi-megabyte caches on disk drive arrays occasionally allows restore speeds
to exceed backup speeds.
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