HP Surestore Disk Array 12h and FC60 - Manual (Page 293)

Managing the Disk Array Using Array Manager 60 293
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Unbinding a LUN
Unbinding a LUN makes its capacity available for the creation of a new LUN. All disks
assigned to the LUN are returned to the Unassigned disk group when the LUN is unbound.
C AUTION
All data on a LUN is lost when it is unbound. Make sure you backup any
important data on the LUN before unbinding it.
Unbinding a LUN will have the same impact on the host as removing a disk.
Before unbinding a LUN, check your operating system documentation for
any additional information or steps that may be required after unbinding a
LUN.
To unbind a LUN, type:
amcfg -D [-force]
• LUN - number assigned to the LUN you want to unbind
• The -force option is required to delete LUN 0. LUN 0 may only be deleted if a UTM LUN
has been enabled via NVSRAM setting. If UTM is disabled, LUN 0 is required for the
SCSI command path. The UTM LUN itself may not be deleted using this command.
Command Example
The following example unbinds LUN 5 on disk array rack_1.
amcfg -D 5 rack_1
Changing LUN Ownership
When binding a LUN, one of the disk array controllers is identified as the owner of the
LUN. It is possible to change the ownership of a bound LUN dynamically - that is, without
unbinding and rebinding the LUN. You may want to change the ownership of a LUN if you
notice an imbalance of I/O loading between controllers. Controller ownership will change
automatically if a failure occurs in the primary I/O path to the LUN.