Specify The Raid Level, Strip Size, And Policies - Hitachi 220H Bios Manual

Table 2-15: Specify the RAID level, strip size, and policies
Menu items Description
1
RAID Level RAID Level
Strip Size Strip size
Access Policy Access policy
Read Policy Read policy
2
Write Policy Write policy
IO Policy Read-cache
operation
3
Disk Cache Setting the disk
cache
3
Disable BGI Setting the
background
initialization
4
Select Size Size of a disk array
Notes:
1 If you add a virtual drive to the already existing Drive Group, you can not change the RAID
level.
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.
3 Change from the default value to the recommended value.
4 When you configure "Select Size", check the maximum allowable capacity displayed under
[Next LD, Possible RAID Levels] at the right of the window. And then you specify the value
at your discretion within the maximum capacity in accordance with the specified RAID level.
When you enter the value, completely delete the value in the box first and then enter the
value.
When you enter the maximum capacity, enter all the digits precisely including decimal
places and make sure you do not skip even zeros.
Hitachi Compute Rack 210H/220H BIOS Guide
Specify any level.
8KB / 16KB / 32KB / [64KB] / 128KB / 256KB /
512KB / 1MB
[RW (reading and writing)] /
Read Only (reading only) /
Blocked (access denied)
[Normal (no read ahead)] /
Ahead (always read ahead)
● 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
[Direct (cache: not used)] /
Cached (cache: used)
[Disable (cache: not used)] /
Enable (cache: used) /
No change (depending on the disk setting)
No (background initializing valid) /
[Yes (background initializing invalid)]
Entering the maximum capacity value.
(minimum allowable value: 64 KB)
MegaRAID WebBIOS
Setting/display value
2-35