We just found out that the installation of DB/2 on a HACMP- (PowerHA-) Cluster running v7.1.3 is not possible due to a bug in HACMP. DB/2-version was 10.5 but this seems to apply to 10.1 too (and probably other versions as well).
The error message the DB/2-installer issues is something like:
The problem is that the RSCT peer domain is created by the HACMP software during the cluster creation and cannot simply be disabled. You can check for the existence of it with the command
Stop PowerHA and wait till the cluster manager is in INIT state, then run this script:
but this didn't help us either because the peer domain simply didn't go away.
Solution: before installing DB/2 delete all configured ressource groups of the cluster, then stop it. This will bring down the RSCT daemons, namely ctrmc. After installing DB/2 you can recreate the ressource groups and bring the cluster online again.
PS: Don't bother to report this bug to IBM: that has already been done.
I hope this helps.
bakunin
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I had a lengthy reply - but it never made it out - sigh.
Just note that RSCT activity is normal, even necessary, to have DLPAR aka Dynamic Resource Management working.
As much has changed in RSCT between the different versions of AIX 5.3 and AIX 7.1 (soon to include AIX 7.2) - your mileage may vary. In any case, ctrmc is supposed to be active all the time. And for years, the cluster manager demon that PowerHA installs is supposed to be active - all the time (in state ST_idle perhaps!).
For a lot of bla bla about what ctrmc is doing try:
My experience with DB2 and installs on AIX is that DB2 (read software group) does add specific stuff for AIX (they use neither installp nor rpm for their install method) - and when AIX changes enough that there modification/specification no longer fits - install may fail, or - more frequently - a warning message that is no longer applicable.
If the install is "uninstalling" itself, rather than just complaining check around in the sub-directory (was named db2_setup if I recall correctly) and see if you can find the test, change the logic (or comment it out) - and see if it works.
Please note - the last time I was doing modifications like this it was still db2 version 9.something.
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