ERROR: Problems encountered creating the CAA cluster. Use the syslog facility to see output from the mkcluster command.

ERROR: Problems encountered creating the CAA cluster. Use the syslog facility to see output from the mkcluster command.

ERROR: Problems encountered creating the CAA cluster. Use the syslog facility to see output from the mkcluster command.

* Normally this kind of error we are facing at the time PowerHA systemMirror migration Prerequisties.

* PowerHA systemMirror clmigcheck utility deducting this kind of errors.

* If suppose we are not resolving this issue, we will not able to perform PowerHA SystemMirror 6.1 to 7.1 migration.

Error Message:

NODE2:# clmigcheck
Saving the existing log, "/tmp/clmigcheck/clmigcheck.log", to
"/tmp/clmigcheck/clmigcheck.log.20160329_1758".

Running a few tests to help validate this environment. Please be patient.

It appears that this is the last node in this cluster that still needs to
be migrated. All the other nodes have already completed their migration to
PowerHA SystemMirror version 7. Please confirm that this is correct, and
then the migration process will be completed by creating an appropriate
CAA cluster on the cluster nodes.

** After the successful creation of the CAA cluster, you _MUST_ install
   SystemMirror version 7 on this node as soon as possible. Until version
   7 is installed, communication with remote nodes will not be possible.

Press  to continue, or "x" to exit...

------------[ PowerHA SystemMirror Migration Check ]-------------

About to configure a 2 node standard CAA cluster, which can take up to 2
minutes.

Press  to continue...

##
## One or more possible problems have been detected:
##

ERROR: Problems encountered creating the CAA cluster. Use the syslog facility
       to see output from the mkcluster command.

Problem Identification:

* This is not a big problem. actually problem is our repository disk.

* Previously our repository disk my be used for some other purpose. that’s why we are facing this kind of problem.

* So we can confirm repository disk previously used for some other purpose or not.

NODE1+NODE2:# /usr/lib/cluster/clras dumprepos -r hdisk4
ERROR: Could not obtain repository data from hdisk4.
Note: It means this disk before never used for repository purpose.

=> this means hdisk4 is OK to be used as disk repository.

Solution for the Problem:

* Format Repository disk on all the cluster nodes.

NODE1+NODE2:# dd if=/dev/zero of=/dev/hdisk4 bs=4096 count=5000
5000+0 records in
5000+0 records out

* Refresh clcomd service on all the nodes.

NODE1+NODE2:# refresh -s clcomd
0513-095 The request for subsystem refresh was completed successfully.

* Run again clmigcheck utility on your cluster last node, it  should be work.

NODE2:# clmigcheck
Saving the existing log, "/tmp/clmigcheck/clmigcheck.log", to
"/tmp/clmigcheck/clmigcheck.log.20160329_1800".

Running a few tests to help validate this environment. Please be patient.

It appears that this is the last node in this cluster that still needs to
be migrated. All the other nodes have already completed their migration to
PowerHA SystemMirror version 7. Please confirm that this is correct, and
then the migration process will be completed by creating an appropriate
CAA cluster on the cluster nodes.

** After the successful creation of the CAA cluster, you _MUST_ install
   SystemMirror version 7 on this node as soon as possible. Until version
   7 is installed, communication with remote nodes will not be possible.

Press  to continue, or "x" to exit...

------------[ PowerHA SystemMirror Migration Check ]-------------

About to configure a 2 node standard CAA cluster, which can take up to 2
minutes.

Press  to continue...

You _MUST_ install the new version of PowerHA SystemMirror now. This node
will not be able to communicate with the other nodes in the cluster until
SystemMirror v7 is installed on it.
NODE1+NODE2:# lspv | grep -i hdisk4
 hdisk4 0ac24b4fb2085a7c caavg_private active

Get the repository disk informations after create caavg_private VG.

NODE1+NODE2:# /usr/lib/cluster/clras dumprepos -r hdisk4

Result:

ERROR: Problems encountered creating the CAA cluster. Use the syslog facility to see output from the mkcluster command. problem successfully resolved.

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