Performance factors for HP ProLiant Serial Attached Storage (SAS)

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Figure 3. Random operations of SAS compared to SATA with HP Smart Array Controller P411 Controller, RAID 0
Performance comparisons between SAS drives
This section includes comparisons of SAS drives based on platter speed, along with differences in
RAID strategies.
Figure 4 below shows that a RAID 0 array of ten SAS Small Form Factor (SFF) 15K rpm drives can
read, or write, a single sequential stream of data 30% faster than a similar array of 10K rpm SFF SAS
drives. Thus, a drive spin increase of 5k rpm can result with a 30% performance increase for both
read and write operations.
40%
60%
80%
100%
120%
140%
160%
4KiB RANDOM
READ Aligned
4KiB RANDOM
WRITE Aligned
4KiB OLTP
Aligned
64KiB RANDOM
READ Aligned
64KiB RANDOM
WRITE Aligned
1MiB RANDOM
READ Aligned
1MiB RANDOM
WRITE Aligned
Relative Performance ( % )
12-SAS-7200, P411, fw:3.50, 512MB, R0(256KB), 1-D2600, 1LD
12-SAS-7200,P411,fw:3.50,512MB, R0(256KB),1-D2600,1LD
RAID-0 Random Performance, P411
12 - 1TB 7.2K 6Gb Midline SAS vs 12 - 1TB 7.2K 3Gb SATA
100%= 7.2K rpm SATA