Hitachi Compute Blade 2000 User Manual page 397

Display item
A RAID Level RAID level
Status Status of the disk array
Strip Size Stripe size of the disk array
Capacity Size of the disk array
Parity Size *1 Size of the parity
B Access Access mode
C Read Read policy
D Disk Cache Setting the cache installed
in a physical hard disk
E I/O Setting the read-cache
operation
F Disable BGI Setting the background
initializing
G Default Write Setting the write cache
*2 *3
*1 This item is shown with RAID Level 5 or 6.
*2 Default Write supports setting in Always Write Back only when the system equipment without a
cache backup module installed is connected to UPS. Even so, set Write through when installing
OS. Otherwise, the installation may not finish properly. Do not set Write Back with BBU.
*3 For the equipment with a cache backup module installed, make sure to set Write Back With BBU
for Default Write. If not, write performance may slow down.
*4 None is shown for Battery Backup in
*5 Present is shown for Battery Backup in
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)
[Disable (cache: not used)]
[Enable (cache: used)
Unchanged (based on the hard disk
setting)]
[Direct (reading from the cache at a cache
hit)] /
[Cached (always reading from the cache)]
No (background initializing valid) /
(background initializing invalid)]
Without cache backup module installed * 4:
[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.)
With cache backup module installed * 5:
Write Through (write-cache invalid)/ Always
Write Back (write-cache
With BBU (Write cache is valid only when a
cache backup module is installed.)]
Properties: Controller properties submenu
Properties: Controller properties submenu 2.
346
Setting/display value **
-
-
-
-
-
/
Ahead
/ Adaptive
/
/
[Yes
valid)/[Write Back
2.