I have setup a 3 node SLES 11 SP1 High Availability Extension cluster as
follows:

server1 and server2 are in our main datacenter and attached to shared
storage (formatted ocfs2) on our Compellent SAN. The name of the block
device for the shared storage is:
/dev/disk/by-id/scsi-vol01 (using multipath user friendly names).
This disk is mounted at /srv/www on both.

server3 is at a remote colo facility, and is attached to another
Compellent SAN, with a disk on that side mounted at /srv/www

Since I can't do a 3-way active/active/active config, I'm going to use
rsync to sync the contents of /srv/www from server1 to server3 at the
remote datacenter.

Anyway, my question/request for suggestions is this:

I have followed the recommended steps for configuring ocfs/dlm,
etc...in Pacemaker as follows:

crm
cib new stack-glue
configure primitive dlm ocfacemaker:controld op monitor
interval=120s
configure clone dlm-clone dlm meta globally-unique=false
interleave=true
end
cib commit stack-glue

crm
cib new oracle-glue
configure primitive o2cb ocfcfs22cb op monitor interval=120s
configure clone o2cb-clone o2cb meta globally-unique=false
interleave=true
configure colocation o2cb-with-dlm INFINITY: o2cb-clone dlm-clone
configure order start-o2cb-after-dlm mandatory: dlm-clone o2cb-clone
cib commit oracle-glue

The next step is:
crm
configure primitive fs ocf:heartbeat:Filesystem \
params device="/dev/disk/by-id/scsi-vol01" directory="/srv/www"
fstype="ocfs2" \
op monitor interval=120s

What this has done is to start up dlm-clone and o2cb-clone on all three
nodes. Since server3 is actually attached to a different physical disk,
and is not shared with server1 and server2 (but the block device name is
the same) I suspect this is going to cause problems. I'm not an expert
on the syntax inside of crm, so how can I start all of this on just
server1 and server2? I really just need csync2 for server3 to keep
/etc/passwd, /etc/shadow, and /etc/group in sync.

I had a few ideas:
1. Start csync2 but not openais on server3
2. Change the name for the block device on server3
3. (probably the best option) - figure out syntax for how to not start
dlm-clone, o2cb-clone, and fs-clone on server3.

Anyone have any advice on how best to proceed with this?

Allen B.


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