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
Summary of Contents for Compute Blade 500 Series
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