MegaRAID
WebBIOS
2-23
Hitachi Compute Rack 210H/220H BIOS Guide
The following table shows description of menu items in the window.
NOTICE
You need connect the AC cables of the system unit to a UPS, when you
use the RAID controller without cache backup module and set
Default
Write
to
Always Write Back
. Otherwise, the data corruption may
result when blackout or momentary loss of power occurs.
If multiple virtual drives reside on the same Drive Group, keep the
same setting for all the virtual drives.
Table 2-12: Virtual Drive menu items
Menu items
Description
Setting/display value
Properties
RAID Level
RAID level
-
Status
Status of the virtual drive
-
Strip Size
Strip size of the virtual drive
-
Capacity
Size of the virtual drive
-
Parity Size
1
Parity size of the virtual drive
Policies
Access Access
mode
[RW (reading and writing)] /
Read Only (reading only) /
Blocked (access denied)
Read Read
policy
[Normal (no read ahead)] /
Ahead (always read ahead)
Disk Cache
Setting the cache installed
in a physical disk
[Disable (cache: not used)] /
[Enable (cache: used) /
No Change (based on the disk setting)
I/O
Setting the read-cache operation
[Direct (cache: not used)] /
Cached (cache: used)
Disable BGI
Setting the background
initialization
No (background initializing valid) /
[Yes (background initializing invalid)]
Default Write
2
Setting the write cache of the disk
array
●
RAID controller with cache backup
module:
Write Through /
Always Write Back /
[Write Back With BBU]
●
RAID controller without cache
backup module:
[Write Through] /
[Always Write Back] /
Write Back With BBU
Notes:
1 This item is displayed when the virtual drive is RAID5 or 6.
2 If you use the RAID controller without cache backup module, use this item with the default setting
when installing an OS. Even if the system unit is connected to a UPS, the install may not finish
normally.
