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:

Code:

Do you want to install the DB2 pureScale Feature? [yes/no]
no
DB2 installation is being initialized.

The DB2 installer detected that an RSCT peer domain is online.  Bring the peer
domain offline in order to allow the DB2 installer to update the TSA
installation.  For more information, see the DB2 Information Center at:
"http://publib.boulder.ibm.com/infocenter/db2luw/v10r1/index.jsp".

A major error occurred while installing "DB2 Enterprise Server Edition " on
this computer. The installation cannot continue. If the problem persists
contact your technical service representative.

For more information see the DB2 installation log at
"/tmp/db2_install.log.3277028".

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

Code:

root@system # lsrpdomain

Googling for a workaround I found this in the usenet group comp.databases.ibm-db2, entry by Mr. Greig Wise:

Stop PowerHA and wait till the cluster manager is in INIT state, then run this script:

Code:

#!/bin/ksh93
touch /usr/es/sbin/cluster/etc/emgr.$$
clctrl -stop -m <nodename>

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