Hitachi Compute Blade 2000 User Manual page 363

 Changing the write policy for disk arrays
This section describes the procedure for changing the write policies.
Enabling Write Cache of a disk array can improve the write performance.
When enabling the disk array "write cache", connect the system equipment to
a UPS. Otherwise, data in the write cache may disappear or be destroyed
durig a blackout or instant power failure.
In Write Policy, "Always Write Back" can be supported only
when the system equipment is connected to the UPS
(uninterruptible power supply).
Even in this case, set to Write Through when installing the
operating system. Otherwise, installation may not be
properly completed.
Select Virtual Drives in the main menu.
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The following screen appears:
NOTICE
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