Changing the write-cache mode
on a logical drive
(Startable-CD mode only.)
Use this action to change the write-cache
mode setting of a logical drive to write through or write back.
- Click a logical drive
from the Main Tree.
- Click Actions -->
Change write-cache mode to write back/write through.
- If you click write back and you
do not have a battery-backup cache, click Yes to confirm your
choice because there is a risk of losing data.
If you click write back and you do have a battery-backup cache, the ServeRAID
Manager changes the mode.
If you click write through, the ServeRAID Manager changes the mode.
The write-cache mode determines if
the controller writes data to the hard disk drive before or after sending a
confirmation to the operating system.
Notes:
- If you configure RAID level-x0
logical drives, all logical drives in the spanned array must be either write
back or write through. That is, the write-cache mode settings for the logical
drives in the spanned array cannot be a mixture of write back and write
through.
- If you configure a fault-tolerant
pair of controllers, the controllers must be configured as write through.
If you have the battery-backup option, it is disabled when you create a fault-tolerant
pair. The write-cache mode is changed automatically from write-back mode to
write-through mode. For more information, refer to the IBM
Netfinity ServeRAID-4x Ultra160 SCSI Controller User's Reference.
See also
Understanding
write-back and write-through modes