Command Reference Guide

–cg <item>
Specifies one or more drive cages. Drive cages are identified by one or more integers (<item>).
Multiple drive cages are separated with a single comma (1,2,3). A range of drive cages is
separated with a hyphen (0–3). The specified drive cage(s) must contain disks.
–mg <item>
Specifies one or more drive magazines. The 1. or 0. displayed in the CagePos column of showpd
output indicating the side of the cage is omitted when using the -mg option. Drive magazines are
identified by one or more integers (<item>). Drive magazines are identified by one or more
integers (<item>). Multiple drive magazines are separated with a single comma (1,2,3). A range
of drive magazines is separated with a hyphen (0–7). The specified drive magazine(s) must contain
disks.
–pn <item>
Specifies one or more disk positions within a drive magazine. Disk positions are identified by one
or more integers (<item>). Multiple disk positions are separated with a single comma (1,2,3).
A range of disk positions is separated with a hyphen (0–3). The specified position(s) must contain
disks.
–dk <item>
Specifies one or more physical disks. Disks are identified by one or more integers (<item>).
Multiple disks are separated with a single comma (1,2,3). A range of disks is separated with a
hyphen (0–3). Disks must match the specified ID(s).
NOTE: The following arguments are used to limit the disks that are used to create logical disks
based on the characteristics of the disk drive.
–tc_gt <number>
Specifies that physical disks with total chunklets greater than the number specified are selected.
–tc_lt <number>
Specifies that physical disks with total chunklets less than the number specified are selected.
–fc_gt <number>
Specifies that physical disks with free chunklets greater than the number specified are selected.
–fc_lt <number>
Specifies that physical disks with free chunklets less than the number specified are selected.
–devid <model>
Specifies that physical disks identified by their models are selected. Models can be specified in a
comma-separated list. Models can be displayed by issuing the showpd -i command.
–devtype <type>
Specifies that physical disks must have the specified device type (FC for Fibre Channel, NL for
nearline, or SSD for solid state drive) to be used. Device types can be displayed by issuing the
showpd command. If it is not specified, the default device type is FC.
-rpm <number>
Disks must be of the specified speed. Device speeds are shown in the RPM column of the showpd
command. The number does not represent a rotational speed for the drives without spinning media
(SSD). It is meant as a rough estimation of the performance difference between the drive and the
other drives in the system. For FC and NL drives, the number corresponds to both a performance
measure and actual rotational speed. For SSD drive, the number is to be treated as relative
performance benchmark that takes into account in I/O per second, bandwidth and the access
time.
644 Tune Commands