HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 54
Read the corresponding parity information.
View all HP Surestore Disk Array FC60 manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 54 highlights
Figure 22 RAID 5 Volume Group With its individual access characteristics, RAID 5 provides high read throughput for small block-size requests (2 KB to 8 KB) by allowing simultaneous read operations from each 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. 54 Disk Array High Availability Features