HP 504062-B21 Performance factors for HP ProLiant Serial Attached Storage (SAS - Page 8

Performance comparisons between SAS drives, Performance comparisons based on form factor

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Performance comparisons between SAS drives This section includes comparisons of SAS drives based on form factor and platter speed, along with differences in RAID strategies. Performance comparisons based on form factor Figures 4 through 8 compare the performance of SFF SAS drives and LFF SAS drives. The following configuration was used for testing the SAS drives: • System: HP StorageWorks 70 Modular Smart Array • SAS Controller: HP Smart Array P800, firmware version 4.06, 512 MB cache Figure 4. Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800 Controller, RAID 0 (128K) % Diff - SFF 15K Performance compared to LFF 15K 130% RAID-0 (128KB) IOMETER 07.30.2004 120% 110% 100% 90% 80% 70% 4KB RANDOM READ 4KB RANDOM WRITE 4KB OLTP 8KB RANDOM READ 8KB RANDOM WRITE 8KB OLTP 64KB RANDOM READ 64KB RANDOM WRITE Level of performance for LFF SAS drives 4 SFF SAS drives 6 SFF SAS drives 8 SFF SAS drives 12 SFF SAS drives 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 As indicated in Figure 4, SFF SAS drive arrays yield better performance in a RAID 0 solution than LFF SAS drive arrays. While providing maximum storage capacity and performance, RAID 0 does not provide any disk redundancy. 8

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Performance comparisons between SAS drives
This section includes comparisons of SAS drives based on form factor and platter speed, along with
differences in RAID strategies.
Performance comparisons based on form factor
Figures 4 through 8 compare the performance of SFF SAS drives and LFF SAS drives. The following
configuration was used for testing the SAS drives:
•
System: HP StorageWorks 70 Modular Smart Array
•
SAS Controller: HP Smart Array P800, firmware version 4.06, 512 MB cache
Figure 4.
Performance comparison: SFF to LFF 15K 72-GB SAS drives with HP Smart Array P800
Controller, RAID 0 (128K)
RAID-0 (128KB)
70%
80%
90%
100%
110%
120%
130%
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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
% Diff - SFF 15K Performance compared to LFF 15K
IOMETER 07.30.2004
4 SFF SAS drives
6 SFF SAS drives
8 SFF SAS drives
12 SFF SAS drives
Level of performance for LFF SAS drives
As indicated in Figure 4, SFF SAS drive arrays yield better performance in a RAID 0 solution than LFF
SAS drive arrays. While providing maximum storage capacity and performance, RAID 0 does not
provide any disk redundancy.
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