Performance factors for HP ProLiant Serial Attached Storage (SAS)

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Figure 13. RAID- 256 KiB Sequential Write
Performance comparisons based on platter speed
The charts in Figure 14 below compare sequential read performance between 10K (rpm) and 15K
SFF SAS drives operating as a 6-drive array with an HP Smart Array P800 controller using RAID 5.
Charts 7A through 7E show the drive array performance for sequential reads per block size at a
specific queue (Q) depth. Queue depth is the number of commands that the storage system is waiting
to execute. In workstations and small server systems, queue depth rarely exceeds 1, but in an
enterprise server environment a large number of users generating requests can result in a queue depth
of tens or hundreds. Chart 7F shows random read IOPS performance.
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1 2 4 6 8 10 12 16 20 24
P800, 3Gb
P411, 6Gb
RAID-0, 256KiB Sequential Write
Transfter Rate ( MiB/s )
Drives