HP 418371-B21 - Dual Port 72 GB Hard Drive, Technology Brief, Page: 9 / 14

Figure 5. Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800
Controller, RAID 1 (128K)
RAID-1 (128KB)
70%
80%
90%
100%
110%
120%
130%
1 2 4 8 1
6
3
2
6
4
1
2
8
2
5
6
1 2 4 8 1
6
3
2
6
4
1
2
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2
5
6
1 2 4 8 1
6
3
2
6
4
1
2
8
2
5
6
1 2 4 8 1
6
3
2
6
4
1
2
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2
5
6
1 2 4 8 1
6
3
2
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4
1
2
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2
5
6
1 2 4 8 1
6
3
2
6
4
1
2
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2
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6
1 2 4 8 1
6
3
2
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1
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1 2 4 8 1
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6
4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE
% D
iff
- SF
F 15K Perf
or
mance c
o
mp
ared t
o
L
F
F
1
5K
IOMETER 07.30.2004
Level of performance for LFF SAS drives
2 SFF SAS drives
4 SFF SAS rives
6 SFF SAS drives
8 SFF SAS drives
12 SFF SAS drives
RAID 1 is a strategy for achieving redundancy rather than enhanced performance. Nevertheless, as
indicated in Figure 5, SFF SAS drives provide better performance than LFF SAS drives for most
RAID 1 configurations.
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