Hitachi Compute Blade 2000 User Manual page 343

10 With all the RAID disk array configurations selected, specify RAID level, stripe
size, read policy, write policy, and disk array size.
When enabling the write cache of the disk array, connect the system equipment
to a UPS. When you use the equipment without connecting to the UPS, data can
disappear and be corrupted.
Set each item to the following values.
Item
RAID Level RAID Level
Stripe Size Stripe size
Access Policy Access policy
Read Policy Read policy
Write Policy *1 Write policy
IO Policy Read-cache operation
Drive Cache Setting the hard disk
cache
Setting the background
Disable BGI
initializing
Select Size *2 Size of a disk array
*1 In Write Policy, Always Write Back can be set only when the system equipment is
already connected to the UPS (uninterruptible power supply). 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
Changing the write policy for disk
*2 Keep the existing maximum capacity value in Select Size.
When you configure a disk array to install an OS

and put a value larger than 2 TB, the OS can only
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.
NOTICE
Content
[RAID 10]
8 KB / 16 KB
512 KB / 1 MB
[RW (reading and writing)] /
Read Only (reading only)
Blocked (access denied)
[Normal (no advanced reading)] /
Ahead (always advanced reading)
Adaptive (advanced 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 use Write Back with BBU.
292
Setting value **
/ 32 KB / [64 KB] / 128 KB / 256 KG /
/
/
Enable (setting valid)
/
/