Hitachi Compute Blade 500 Series User Manual page 258

Disk Cache Policy
Disable BGI
Select Size
Notes:
1
.
2
.
Note: When a drive group contains multiple disk arrays, specify the same
setting values on all disk arrays in the drive group.
Tip:
•
•
11 One of the following windows appears.
.
– When you select Write Through in the write policy setting, the
following window appears. Click Yes.
– When you select Always Write Back in the write policy setting, the
following window appears. Click Yes.
4-48
Menu items
Setting the disk cache
Setting the background
initialization
2 Size of a disk array
In Write Policy, Write Back with BBU is supported only. If not, write
performance may be degraded.
The maximum Select Size to be set is shown under Next LD, Possible RAID
Levels on the right pane. Type any value within the maximum size for the RAID
level that you set. Delete the existing value in the text box before typing
another value. When specifying the maximum size, click Update Size.
When you configure a disk array to install an OS and put a value
larger than 2 TB, the OS can recognize up to 2 TB.
If you specify a larger disk array size than the maximum capacity,
Unacceptable size is displayed on the window and all the setting
items are initialized. You need to reset all items to the correct size.
MegaRAID WebBIOS for storage expansion blades
Hitachi Compute Blade 500 Series EFI User's Guide
Description
Cached (always reading from the
cache)
[Disable (setting invalid)] / Enable
(setting valid) / <<Unchanged
(depending on the hard disk
setting)>>
<<No (background initializing
valid)>> /
[Yes (background initializing invalid)]
Enter any value within the maximum
capacity value. The lowest available
value is 64 KB.
Setting/display value