Dell PowerVault MD3000i - Manual (Page 144)

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Script Commands
Parameters
Parameter Description
controller 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.
loopbackPhysicalDiskChannel 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.