HP 516814-B21 Performance factors for HP ProLiant Serial Attached Storage (SAS - Page 9

Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800, Controller

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Figure 5. Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800 Controller, RAID 1 (128K) % Diff - SFF 15K Performance compared to LFF 15K 130% RAID-1 (128KB) IOMETER 07.30.2004 120% 110% 100% 90% 80% 70% 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE 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 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 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. 9

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Figure 5.
Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800
Controller, RAID 1 (128K)
RAID-1 (128KB)
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100%
110%
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130%
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4KB RANDOM READ
4KB RANDOM WRITE
4KB OLTP
8KB RANDOM READ
8KB RANDOM WRITE
8KB OLTP
64KB RANDOM READ
64KB RANDOM WRITE
% Diff - SFF 15K Performance compared to LFF 15K
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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