HP 504062-B21 Performance factors for HP ProLiant Serial Attached Storage (SAS - Page 6

array with HP Smart Array Controller P400 Controller, RAID 1

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Figure 2. Relative performance: random operations of non-NCQ SATA, NCQ SATA, and SAS 2-drive array with HP Smart Array Controller P400 Controller, RAID 1 RELATIVE PERFORMANCE (%) 700% Random Operations, RAID 1 (128 KB) IOMETER 07.30.2004 600% 500% 400% 300% 200% 100% 0% 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE SATA, Non-NCQ 60-GB, 5.4K, 25/75 R/W cache (baseline performance level) SATA, NCQ 120-GB, 5.4K, 25/75 R/W cache SAS, 72-GB, 15K, 25/75 R/W cache 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 256 128 64 32 16 8 4 2 1 The HP P400 controller supports NCQ, so the NCQ SATA drives provide an increase in performance over non-NCQ SATA drives. The SAS arrays, however, are much faster than either of the SATA arrays and exhibit a substantial performance increase for most operations. Figure 3 compares the throughput performance of the SATA and SAS drives in the same configuration, and illustrates the substantial improvement of SAS drives. 6

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Figure 2.
Relative performance: random operations of non-NCQ SATA, NCQ SATA, and SAS 2-drive
array with HP Smart Array Controller P400 Controller, RAID 1
Random Operations, RAID 1 (128 KB)
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4KB RANDOM READ
4KB RANDOM WRITE
4KB OLTP
8KB RANDOM READ
8KB RANDOM WRITE
8KB OLTP
64KB RANDOM READ
64KB RANDOM WRITE
RELATIVE PERFORMANCE (%)
IOMETER 07.30.2004
SATA, Non-NCQ 60-GB, 5.4K, 25/75 R/W cache (baseline performance level)
SATA, NCQ 120-GB, 5.4K, 25/75 R/W cache
SAS, 72-GB, 15K, 25/75 R/W cache
The HP P400 controller supports NCQ, so the NCQ SATA drives provide an increase in performance
over non-NCQ SATA drives. The SAS arrays, however, are much faster than either of the SATA
arrays and exhibit a substantial performance increase for most operations.
Figure 3 compares the throughput performance of the SATA and SAS drives in the same
configuration, and illustrates the substantial improvement of SAS drives.
6