Table 4-14 Specify the RAID level, strip size, and policies
Menu items Description Setting/display value
RAID Level
1,2
RAID Level Specify any level.
Strip Size
3
Strip size
(only for RAID 0 and 5)
8 KB/16 KB/32 KB/[<<64
KB>>]/128 KB/256 KB/512 KB/1
MB
Access Policy Access policy [<<RW (reading and writing)>>] /
Read Only (reading only) /
Blocked (access denied)
Read Policy Read policy [<<Normal (no advance
reading)>>] /
Ahead (always advance reading)
Write Policy
4
Write policy <<Write Through (write cache
invalid)>> /
Always Write Back (write-cache
valid) /
[Write Back with BBU (Write cache
is valid only when the cache backup
module is installed)]
IO Policy Read-cache operation [<<Direct (reading from the cache
at a cache hit)>>] /
Cached (always reading from the
cache)
Disk Cache Policy Setting the disk cache [<<Disable (setting invalid)]/
Enable (setting valid)>> /
Unchanged (depending on the hard
disk setting)
Disable BGI Setting the background
initialization
<<No (background initializing
valid)>> /
[Yes (background initializing
invalid)]
Select Size
5
Size of a disk array Enter any value within the
maximum capacity value. The
lowest available value is 64 KB.
Notes:
1. AID 6 with 3 hard disks and RAID 1 with 3 or more hard disks are not
supported.
2. When you add a disk array to the existing drive group, the RAID level cannot be
changed.
3. For RAID 1, set 64 KB by Default.
4. In Write Policy, Write Back with BBU is supported only. If not, write
performance may be degraded.
5. Maximum capacity size that can be set is shown under Next LD, Possible
RAID Levels
at the right of the window. Type a new value within the maximum
MegaRAID WebBIOS for storage expansion blades
4-35
Hitachi Compute Blade 500 Series EFI User's Guide
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