Dell PowerVault MD3000i Cli Manual page 142

Parameters
Parameter
controller
loopbackPhysicalDiskChannel
142
Script Commands
Description
RAID controller module on which to run
the diagnostic tests. Valid RAID controller
module identifiers are 0 or 1, where 0 is
the RAID controller module on the left
and 1 is the RAID controller module on
the right when viewed from the rear of the
enclosure. You must put brackets ([ ])
around the RAID controller module
identifier. If you do not specify a RAID
controller module, the storage
management software returns a syntax
error.
Physical disk channel on which to run the
diagnostic tests. You can choose to run
the diagnostics on all channels or select a
specific channel on which to run
diagnostics. Valid physical disk channel
values are 1 or 2.
NOTE:
When you run a data loopback test,
you can optionally specify a file that
contains a data pattern. If you do not
specify a file, the firmware provides a
default pattern.