Hitachi Compute Blade 2000 User Manual page 334

Set each item value in the following table.
Item
RAID Level *1 RAID Level
Stripe Size *2 Stripe size
(only RAID 0 and 5)
Access Policy Access policy
Read Policy Read policy
Write Policy *3 Write policy
IO Policy Read-cache operation
Setting the hard disk
Drive Cache
cache
Disable BGI Setting the background
initializing
Select Size *4 *5 Size of a disk array
*1 RAID 6 with three hard disks and RAID 1 with three or more hard disks are not
supported.
*2 For RAID 1, set 64 KB by Default.
In Write Policy, Write Back can be set only when the system equipment is already
*3
connected to the UPS (uninterruptible power supply). Confirm that the checkmark is
removed from Wrthru for BAD BBU at that time. Even in this case, set Write
Through when the operating system is installed. Otherwise, installation may not be
properly completed. Change the setting after installing the OS referring to
the write policy for disk
*4 Maximum capacity size that can be set is shown under Next LD, Possible RAID
Levels at the right of the screen. Change the maximum capacity value for your RAID
level. Type the fraction portion of the maximum capacity value correctly and do not
omit the value 0 (zero).
firmware version: 2.120.233-1474
*5 For
maximum capacity at the RAID level specified in RAID Level.
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" appears
on the screen and all the setting items are
initialized. You need to set all items again
including the correct size.
Content
Specify any level.
8 KB / 16 KB
512 KB / 1 MB
[RW (reading and writing)] /
Read Only (reading only)
Blocked (access denied)
[Normal (no advance reading)] /
Ahead (always advance reading)
Adaptive (advance reading only in the event of
sequential access)
[Write Through (write cache invalid)] /
Always Write Back (write-cache valid) /
Write Back with BBU (Write cache is valid only when
the battery is installed.)
[Direct (reading from the cache at a cache hit)] /
Cached (always reading from the cache)
[Disable (setting invalid)] /
No change (depending on the hard disk setting)
No (background initializing valid)
[Yes (background initializing invalid)]
Entering the maximum capacity value.
arrays. Do not select Write Back with BBU.
or later
283
Setting value **
/ 32 KB / [64 KB] / 128 KB / 256 KB /
/
/
Enable (setting valid)
/
, clicking Update Size inputs the
/
Changing