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. The write-cache mode determines if the controller
writes data to the drive before or after sending a confirmation to the operating
system.
Notes:
-
- (RAID level-x0 only.) All logical drives in a 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.
- (Failover environment only.) A fault-tolerant controller pairing must be
configured as write through. This is because the logical drives are configured
as "Shared." For more information, refer to the IBM
ServeRAID-4 Ultra160 SCSI Controller User's Reference.
- (Cluster environment only.) If the logical drives are configured as "Shared,"
the controllers must be configured as write through. For more information,
refer to the IBM ServeRAID-4 Ultra160 SCSI Controller
User's Reference.
- In the tree, click
(logical drive).
- Right-click Change write-cache mode to write back or 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.
More information
x-0325-SRM-00-00-EN