if the controller has a
Syntax:
<target> modify cr=#/#?
where <target> is a controller, and #/# is the cache ratio in the format read percentage/write
percentage.
Example command:
=> ctrl slot=3 modify cr=25/75
Changing the surface scan delay time
The setting for the surface scan delay determines the time interval for which a controller must be inactive before a surface scan analysis is started on the physical drives that are connected to it.
Surface scan analysis is an automatic background process that ensures that you can recover data if a drive failure occurs. The scanning process checks physical drives in
Syntax:
<target> modify ssd=#
where <target> is a controller and # is a number between 1 and 30. This number determines the delay time in seconds, but you do not need to include units with the command.
Example command:
=> ctrl sn=P56350D9IP903J modify ssd=3
Re-enabling a failed logical drive
If a logical drive has failed and the data on it is invalid or
Syntax:
<target> modify reenable [forced]
Example command:
=> ctrl slot=3 ld 1 modify reenable forced
Enabling or disabling the drive cache
On controllers and drives that support physical drive write cache, you can use this command to enable or disable the write cache for all drives on the controller.
CAUTION: Because physical drive write cache is not
Syntax:
<target> modify drivewritecache=enabledisable [forced]
where <target> is a controller that supports drive write cache.
Example command:
=> ctrl slot=5 modify dwc=enable
Using the Command Line Interface 53
