IBM Power System POWER7 Series Common Service Procedures page 154

No: Go to step 11.
Yes: Power off the partitions running Linux and go to step 11.
11. Determine if any of the I/O resources in the expansion unit are owned by partitions running AIX.
Are any of the I/O resources in the expansion unit owned by partitions running AIX?
v No: Go to step 12.
v Yes: Do the partitions have a code level that supports the powering off and on of an expansion
unit with the partition running? The required level for AIX 5.2 is 5.2.0.61 or later and the required
level for AIX 5.3 is 5.3.0.22 or later. You can determine the level of AIX by entering the command
lslpp -l devices.chrp.base.rte from the AIX command line.
– Yes: Does the HMC have a code level that supports power off and on of an expansion unit with
I/O resources assigned to active partitions running AIX? The required HMC code level is
version 4, release 5.0 or later. You can view the HMC code level by accessing: Licensed Internal
Code Maintenance > HMC Code Update. The code level appears in the content area.
Yes: Go to step 12.
No: Power off the partitions that are running AIX and that own I/O resources in the
expansion unit, then go to step 12.
– No: Power off the partitions that are running AIX and that own I/O resources in the expansion
unit, then go to step 12.
12. Work with the customer to end I/O activity to the expansion unit by performing the following steps.
If all partitions that own I/O resources in the expansion unit have been powered off, skip this step
and go to step 13.
v In IBM i partitions:
– Work with the customer to vary off all configuration descriptions (for example, ctl, device, line,
network server, etc.) that use resources in the expansion unit. This can be done by using the
vrycfg command. The system will prevent the expansion unit from being powered off unless all
configuration descriptions that use resources in the expansion unit are varied off. If an attempt
is made to power off the expansion unit when there are configuration descriptions that use
resources in the expansion unit that are varied on, a descriptive error message will be
presented.
Note: If configuration descriptions that use resources in the expansion unit cannot be varied
off, the procedure must be delayed until they can be varied off or the partitions that have such
configuration descriptions must be powered off.
– If the expansion unit contains disk unit IOPs, IOAs, or both, and the disk units are not
mirrored to disk units in other expansion units, work with the customer to end all
communications activities to these disk units by ending all subsystems.
Note: The system allows you to power off the expansion unit even if this is not done, however,
doing so may result in a disk unit attention SRC and a partial or complete hang of the partition
until the expansion unit is powered on.
– If the expansion unit contains disk unit IOPs, IOAs, or both, and these disk units are mirrored
to disk units in other expansion units, you do not need to end all subsystems. Mirroring will
assist during the service action.
v In AIX partitions:
– Work with the customer to unconfigure all logical device resources that use resources in the
expansion unit. This can be done by using the rmdev command. The system will prevent the
expansion unit from being powered off unless all logical device resources that use resources in
the expansion unit are unconfigured. If an attempt is made to power off the expansion unit
when there are configured logical device resources that use resources in the expansion unit, a
descriptive error message is presented.
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