Remove a node from a 3 node SG cluster

[Adam Garsha]

I want to remove "db2" from a three node cluster made up of (db1,db2,db3). I plan to then re-cluster db2 to an independent cluster with db4 .

Would this work (and not upset packages running on db1 and db3); we use quorum server that is aware of db1, db2, db3, db4 and manages quorum for these two clusters (db1,db2,db3 and db4):

From db1 with both db1 and db3 running production packages:

cmhaltnode db2
cmgetconf cmclconfig.ascii
cp cmclconfig.ascii cmclconfig.just-in-case
# edit cmclconfig.ascii, remove meantion of db2 and its network interfaces
cmcheckconf -v -C cmclconfig.ascii
cmapplyconf -v -C cmclconfig.ascii
# adjust storage presentations so that db1,db3 LUNs are not visible to db2


Do I then also need to "cmdeleteconf" on db2? before I wed it to db4?

Next, on db4:

cmgetconf cmclconfig.ascii
cmgetconf cmclconfig.just-in-case
# edit cmclconfig.ascii to include db2 networking stuff
cmcheckconf -v -C cmclconfig.ascii
cmapplyconf -v -C cmclconfig.ascii
# adjust storage presentations and make sure db2 is in packages as a candidate for failover

[Hasan Atasoy · Accepted solution]

hi ,
after deleting db2 from orijinal cluster also delete
db2 related lines from
/etc/cmcluster/cmclnodelist
and
/.rhosts

Hasan.

[skt_skt]

Do I then also need to "cmdeleteconf" on db2? before I wed it to db4?

Not required. The earlier steps mentioned is sufficient enough. You may verify the nodes active in the cluster by "cmviewcl -l node"