Performance factors for HP ProLiant Serial Attached Storage (SAS)

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Figure 15. Random read performance, RAID 5
As indicated in Figure 15, 15K drive arrays consistently provide higher random read IOPS than 10K
drive arrays. Also, overall performance scales with array size (number of drives). Note that
performance is best when retrieving data blocks that are larger than the RAID 5 stripe size (128 KB in
this case). Configure the stripe size accordingly to maximize performance for a specific application.
SAS drive specifications
Table 3 below compares the seek time and power consumption of SFF (2.5-inch) SAS drives available
from HP at the time of publication.
NOTE:
Drive types and specifications are subject to change without notice.
Refer to the following site for a listing and specifications of
currently available SAS drives:
http://h18004.www1.hp.com/products/servers/proliantstorage/
serial/sas/index.html
2500
2000
1500
1000
500
IOPS
No. of drives
10K HDD & P400 controller
15K HDD & 6402 controller
4 KB Random Read
3 4 5 6 7 8
64 KB Random Read
3 4 5 6 7
8
512 KB Random Read
3 4 5 6 7 8