[Pacemaker] Dual primary drbd + ocfs2: problems starting o2cb

Elmar Marschke elmar.marschke at schenker.at
Fri Aug 16 09:04:44 EDT 2013

Hi all,

i'm working on a two node pacemaker cluster with dual primary drbd and 

Dual pri drbd and ocfs2 WITHOUT pacemaker work fine (mounting, reading, 
writing, everything...).

When i try to make this work in pacemaker, there seems to be a problem 
to start the o2cb resource.

My (already simplified) configuration is:
node poc1 \
	attributes standby="off"
node poc2 \
	attributes standby="off"
primitive res_dlm ocf:pacemaker:controld \
	op monitor interval="120"
primitive res_drbd ocf:linbit:drbd \
	params drbd_resource="r0" \
	op stop interval="0" timeout="100" \
	op start interval="0" timeout="240" \
	op promote interval="0" timeout="90" \
	op demote interval="0" timeout="90" \
	op notifiy interval="0" timeout="90" \
	op monitor interval="40" role="Slave" timeout="20" \
	op monitor interval="20" role="Master" timeout="20"
primitive res_o2cb ocf:pacemaker:o2cb \
	op monitor interval="60"
ms ms_drbd res_drbd \
	meta notify="true" master-max="2" master-node-max="1" target-role="Started"
property $id="cib-bootstrap-options" \
	no-quorum-policy="ignore" \
	stonith-enabled="false" \
	dc-version="1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff" \
	cluster-infrastructure="openais" \
	expected-quorum-votes="2" \

First error message in corosync.log as far as i can identify it:
lrmd: [5547]: info: RA output: (res_dlm:probe:stderr) dlm_controld.pcmk: 
no process found
[ other stuff ]
lrmd: [5547]: info: RA output: (res_dlm:start:stderr) dlm_controld.pcmk: 
no process found
[ other stuff ]
  lrmd: [5547]: info: RA output: (res_o2cb:start:stderr) 
2013/08/16_13:25:20 ERROR: ocfs2_controld.pcmk did not come up

You can find the whole corosync logfile (starting corosync on node 1 
from beginning until after starting of resources) on:

syslog shows:
ocfs2_controld.pcmk[5774]: Unable to connect to CKPT: Object does not exist

Output of crm_mon:
Stack: openais
Current DC: poc1 - partition WITHOUT quorum
Version: 1.1.7-ee0730e13d124c3d58f00016c3376a1de5323cff
2 Nodes configured, 2 expected votes
4 Resources configured.

Online: [ poc1 ]
OFFLINE: [ poc2 ]

  Master/Slave Set: ms_drbd [res_drbd]
      Masters: [ poc1 ]
      Stopped: [ res_drbd:1 ]
  res_dlm	(ocf::pacemaker:controld):	Started poc1

Migration summary:
* Node poc1:
    res_o2cb: migration-threshold=1000000 fail-count=1000000

Failed actions:
     res_o2cb_start_0 (node=poc1, call=6, rc=1, status=complete): 
unknown error

This is the situation after a reboot of node poc1. For simplification i 
left pacemaker / corosync unstarted on the second node, and already 
removed a group and a clone resource where dlm and o2cb already had been 
in (errors were there also).

Is my configuration of the resource agents correct?
I checked using "ra meta ...", but as far as i recognized everything is ok.

Is some piece of software missing?
dlm-pcmk is installed, ocfs2_controld.pcmk and dlm_controld.pcmk are 
available, i even did additional links in /usr/sbin:
root at poc1:~# which ocfs2_controld.pcmk
root at poc1:~# which dlm_controld.pcmk
root at poc1:~#

I already googled but couldn't find any useful. Thanks for any hints...:)

kind regards

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