HP Surestore Disk Array 12h - And FC60 Service Manual page 54
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Figure 22
Volume Group
RAID 5
With its individual access characteristics, RAID 5 provides high read throughput for small
block-size requests (2
K
disk in the volume group. During a write I/O, the disk array must perform four individual
operations, which affects the write performance of a RAID 5 volume group. For each write,
the disk array must perform the following steps:
1.
Read the existing user data from the disks.
2.
Read the corresponding parity information.
3.
Write the new user data.
4.
Calculate and write the new parity information.
Write caching can significantly improve the write performance of a RAID 5 volume group.
RAID 5 is good for parallel processing (multi-tasking) applications and environments. The
performance of a RAID 5 volume group is best when the maximum number of disks (six) is
used.
Disk Array High Availability Features
54
B to 8
B) by allowing simultaneous read operations from each
K
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