NEC Express 5800 Series User Manual page 57

failure occurs. If the array does not have an online spare, rebuilding begins when the failed physical drive is
replaced.
Syntax:
<target> modify rp=high|mediumhigh|medium|low|?
where <target> is a controller.
Example command
=> ctrl slot=3 modify rp=high
Changing the Expand Priority setting
The Expand Priority setting determines the urgency with which the controller treats an internal command to
expand an array.

At the low setting level, normal system operations take priority over an array expansion.

At the medium setting, expansion occurs for half of the time, and normal system operations occur for
the rest of the time.

At the high setting, the expansion takes precedence over all other system operations.
Syntax:
<target> modify ep=high|medium|low|?
where <target> is a controller.
Example command:
=> ctrl slot=3 modify ep=high
Setting the surface scan mode
The surfacescanmode keyword sets the surface mode for the controller. The available modes are disable,
high, or idle. If you specify the idle mode, you must also specify a surface scan delay value.
Syntax:
<target> modify [ surfacescanmode=disable | idle | high | ? ]
Example commands:
controller slot=1 modify surfacescanmode=high
controller slot=1 modify surfacescanmode=disable
controller slot=1 modify surfacescanmode=idle surfacescandelay=3
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 fault-tolerant logical drives for bad sectors,
and in RAID 5 or RAID 6 (ADG) configurations, it also verifies the consistency of parity data.
Syntax:
<target> modify ssm=idle 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 ssm=idle ssd=3
Parallel Surface Scan
This commands allows the user to set the parallel surface scan count for the controller. A value of "1" will
disable the feature, and the maximum count value is "16".
SSA CLI 57