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Work with device parity protection: Select this option to perform the system
functions that handle device parity protection on the system. Device parity
protection is a data redundancy feature available on some storage media units. It is
maintained across all the units that are within the parity set. If one unit fails, the
units within the set handle the functions for the failed unit. This type of protection
can improve system availability and reduce the possibility of data loss. The
following options are available:
v Display device parity status
Select this option to show the status of disk unit subsystems that have device
parity protection.
v Start device parity protection
Use this option to begin the process of protecting data on the system.
v Stop device parity protection
This option allows you to end device parity protection.
v Include unit in device parity protection
This option allows you to add an unprotected disk unit to an existing parity set.
v Exclude unit in device parity protection
This option allows you to remove a disk unit from a parity set.
Work with disk compression: Select this option to display disk compression
status, or select this option to start or stop disk compression.
The following options are available:
v Display disk compression
Select this option to display the status of compressed disks.
v Start compression on disk units
Select this option to start compression on disk units. This will increase the
effective size of the disk unit.
v Stop compression on disk units
Select this option to stop compression on disk units.
Work with disk unit recovery: Select the Work with Disk Unit Recovery display
from the Work with disk units option on the Use Dedicated Service Tools (DST)
display. Options are available to save and restore disk units, find and assign disk
units that are missing from the configuration, replace disk units, reclaim IOP cache
storage, and recover the system configuration if it is lost, destroyed, or changed.
v Save disk unit data
Run this option when the disk unit reference code (URC) indicates that a disk
enclosure should be exchanged.
Before removing the disk enclosure and installing a new disk enclosure, you
should save the data from the disk units in the disk enclosure to removable
media.
When the system has saved all of the disk unit data to removable media, an
ending display appears with the status information.
Note: This procedure does not save the Licensed Internal Code on the
load-source disk unit.
Note: The option is not allowed for disk units that have device parity protection
or mirror protection (with both units in an active state.)
v Restore disk unit data
20 Service Functions V5R2