HP 507610-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