Attention: Perform this procedure only if instructed to do so by a service action
or the IBM support center. If you have a single control enclosure, this procedure
requires that you shut down your system to replace the control enclosure. If you
have more than one control enclosure, you can keep part of the system running,
but you lose access to the volumes that are on the affected I/O group and any
volumes that are in other I/O groups that depend on the drives that are in the
affected I/O group. If the system is still doing I/O requests in all the I/O groups,
schedule the replacement during a maintenance period or other time when the I/O
can be stopped.
Be careful when you are replacing the hardware components that are located in the
back of the system that you do not inadvertently disturb or remove any cables that
you are not instructed to remove.
Ensure that you are aware of the procedures for handling static-sensitive devices
before you remove the enclosure.
Procedure
To replace a control enclosure, complete the following steps:
1. If you are able to access either of the node canisters with the service assistant,
record the machine type and model of the enclosure, the serial number of the
enclosure, and the two world-wide node names (WWNNs) for the enclosure.
v From the service assistant home page, open the location data for the node.
Record the machine type and model (MTM), the serial number, WWNN 1
and WWNN 2 from the enclosure column.
v If you are replacing the enclosure because neither node canister can start,
retrieve this information after you finished the replacement.
a. Start the service assistant on one of the canisters.
b. Go to the node location data on the home page.
c. Record the machine type and model, the serial number, WWNN 1 and
WWNN 2 from the node copy column.
The machine type and model and the serial number are also shown on
the labels at the front and back of the enclosure.
2. If the enclosure is still active, shut down the block host I/O and the Metro
Mirror and Global Mirror activity to all the volumes that depend on the
affected enclosure.
This statement applies to all volumes in the I/O group that are managed by
this enclosure plus any volumes in other I/O groups that depend on the
drives in the affected I/O group.
3. If your system contains a single I/O group and if the clustered system is still
online, shut the system down by following the procedure in “Turning off the
system”.
4. If your system contains more than one I/O group, you might not need to
power down the file modules if the enclosure is not connected to the file
modules and if the drives that are managed by this enclosure are not used in
any file volumes. Use the following procedure to see if any file volumes are
affected:
a. Use the output from the lsenclosure CLI command to determine the
enclosure_id for the control enclosure that is to be replaced.
b. Use the following CLI command to find the volumes that depend on this
enclosure:
lsdependentvdisks -enclosure <enclosure_id>
Chapter 5. Control enclosure 335
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