Hitachi Compute Blade 2000 User Manual page 244

Display item
A RAID Level RAID level
Status Status of the disk array
Capacity Size of the disk array
Strip Size Stripe size of the disk array
B Access *1 Access mode
C Read Read policy
D Default Write Setting the write cache
*2 *3
E Disable BGI *1 Setting the background
initializing
Setting the cache installed
F Disk Cache *1
in a physical hard disk
G I/O *1 Setting the read-cache
operation
*1 Make sure to set the default value or recommended value to use this item.
*2 Default Write supports setting in Always Write Back only when the system equipment is
connected to an uninterruptible power supply (UPS). Even so, set Write through when installing
OS because the installation might not finish properly.
*3 Do not select Write Back with BBU.
When enabling the write cache of the disk array, connect the system equipment to
UPS. When you use the equipment without connecting to the UPS, data can disappear
and be corrupted.
What is displayed
[RW (reading and writing)] /
Read Only (reading only)
Blocked (access denied)
[Normal (no advance reading)] /
(always advance reading)
(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.)
No (background initializing valid) /
(background initializing invalid)]
[Disable (cache: not used)] /
[Enable (cache: used)
No change (based on the hard disk setting)]
[Direct (reading from the cache at a cache
hit)] /
[Cached (always reading from the cache)]
NOTICE
193
Setting/display value **
-
-
-
-
/
Ahead
/ Adaptive
[Yes
/