Chaparral K5312/K7313 - Manual (Page 113)

Managing Disk Drives and Enclosures
8-5
To clear metadata from a drive:
1
From the System Menu, select Utilities Menu and press Enter.
The Utilities Menu screen displays.
2
Select Drive Utilities Menu and press Enter.
The Drive Utilities Menu screen displays.
3
Select Clear Metadata and press Enter.
The Select Drive screen displays showing drives that are not array members.
4
Select the drive you want and press Enter.
You can now use this drive in an array or as a spare.
Enabling and Disabling Write-back Cache
You can control the write-back cache setting for all of your disk drives at once.
Changes take effect after the next rescan or reboot.
This can be set to ENABLE, DISABLE, or DON’T MODIFY (which means the
controller should not change any drive’s write-back cache settings). The default
setting is DON’T MODIFY.
Typically, if your drives are part of an array, you do not want to turn on write-back
cache on the drives. The controller is already using write-back cache to improve
performance. Turning on write-back cache on the disk drive may improve
performance in some cases, depending on the type of array and how you are using it.
Any disk drives with write-back cache enabled should be connected to an
Uninterruptable Power Supply (UPS) in case of power failure. If the drives are not on
a UPS and power is lost during disk writes, the array will lose any data in the disk’s
write-back cache.
To change the write-back cache setting:
1
From the System Menu, select Configuration Menu and press Enter.
The Configuration Menu screen displays.