Performance factors for HP ProLiant Serial Attached Storage (SAS)

Figure 5 below illustrates that a RAID-0 array of ten 15K rpm SFF SAS drives achieves between 35%

and 45% more 4KiB Random Read IOPS than a RAID-0 array of ten 10K rpm SFF SAS drives.

The figure also shows that when running a mixture of 33% 4KiB Random Write and 67% 4KiB

Random Read I/O, ten SFF 15K rpm drives achieves between 25% and 45% more IOPS.

Once again, drives spinning only 5K rpm faster can result in a significant performance increase.

Figure 5. Performance comparison of ten 10K SFF drives Raid 0 with ten 15K SFF drives RAID-0.

Figures 6 and 7 below reveal that a RAID-5 array of four 15K rpm SFF SAS drives is more than 25%

faster in executing a single sequential read stream, or a single sequential write stream, than a RAID-5

array of four 10K SFF SAS drives.

Once again, a higher rpm spin rate will increase performance. However, the performance is not as

great as other combinations due to RAID-5’s additional parity management operations.

40%

60%

80%

100%

120%

140%

160%

4KiB RAN

READAligned

4KiB OLTP

Aligned

Relative Performance - ( % )

1x10-Drv, P411, fw:3.50, 512MB, R0(256KB), 1-D2700, 1LD

100%= 10K; fw:3.50

Random Performance; P411, RAID-0

10-146GB 15K, 6Gb SFF SAS vs 10-146GB 10K, 6Gb SFF SAS