Performance factors for HP ProLiant Serial Attached Storage (SAS)

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Figure 7. Write performance comparison of four 10K SFF drives RAID-5 with four 15K SFF drives RAID-5.
Figure 8 below displays performance differences between a RAID-5 array of ten 15K rpm SFF SAS
drives, compared to a RAID-5 array of ten 10K rpm SFF SAS drives. The 15K array is approximately
40% faster on 4KiB, 64KiB and 1MiB random read IOPS.
The chart also illustrate how a faster rotation rate yield speedier access times; 4KiB online transaction
processing (OLTP) is between 13% and 45% faster with the 15K drives; the 64KiB Random Write is
around 20% faster; and 1MiB Random write is more than 30% faster.
40%
60%
80%
100%
120%
140%
160%
64KiB
SEQ WRITE
256KiB
SEQWRITE
512KiB
SEQ WRITE
1MiB
SEQ WRITE
Relative Performance - ( % )
1x4-Drv, P411, fw:3.50, 512MB, R5(256KB), 1-D2700, 1LD
1x4-Drv,P411,fw:3.50,512MB,R5(256KB),1-D2700,1LD
100%= 10K SFF; fw:3.50
RAID-5 Sequential Write Performance; P411
4-146GB 15K, 6Gb SFF SAS vs 4-146GB 10K, 6Gb SFF SAS