[DRBD-user] DRBD detects split brain when started with Pacemaker

Jonathan-Marc Lapointe jmlapointe at ccdmd.qc.ca
Tue Jun 25 15:00:24 CEST 2013

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Hi dear list members !

I have a procluster project I'm working on right now and I have a little
problem I'd like you to help me with.

I'm configuring Pacemaker and Corosync.

But when pacemaker starts DRBD, it detects a split brain and the status is:

drbd driver loaded OK; device status:
version: 8.3.13 (api:88/proto:86-96)
srcversion: C0F510A918B92928FB51EE3
m:res  cs          ro               ds                 p       mounted 
0:r0   StandAlone  Primary/Unknown  UpToDate/DUnknown  r-----

On both servers.

But If I start it using the standard init script, it's all fine.

Here are my configs:

resource r0 {
  syncer {
    rate 1000M;
  startup {
    wfc-timeout 15;
    degr-wfc-timeout 60;
    become-primary-on both;
  net {
    after-sb-0pri discard-zero-changes;
    after-sb-1pri discard-secondary;
    after-sb-2pri disconnect;
    cram-hmac-alg sha1;
    shared-secret "secret";
  on web1dev {
    device    /dev/drbd0;
    disk      /dev/mapper/groupe1-data;
    meta-disk internal;
  on web2dev {
    device    /dev/drbd0;
    disk      /dev/mapper/groupe1-data;
    meta-disk internal;

And Pacemaker:

primitive p_drbd ocf:linbit:drbd \
    params drbd_resource="r0" \
    op start interval="0" timeout="240s" \
    op promote interval="0" timeout="90s" \
    op demote interval="0" timeout="90s" \
    op notify interval="0" timeout="90s" \
    op stop interval="0" timeout="100s" \
    op monitor interval="20s" role="Slave" timeout="20s" \
    op monitor interval="10s" role="Master" timeout="20s"
ms ms_drbd p_drbd \
    meta master-max="2" clone-max="2" notify="true" is-managed="true"

What could be possibly wrong ?

CCDMD 20 ans !

Jonathan-Marc Lapointe
Technicien en informatique,
Administrateur système,
Administrateur réseau

Centre collégial de développement de matériel didactique
6220, rue Sherbrooke Est, bureau 404
Montréal (Québec) H1N 1C1
514) 864-8443
www.ccdmd.qc.ca <http://www.ccdmd.qc.ca>
jmlapointe at ccdmd.qc.ca <mailto:jmlapointe at ccdmd.qc.ca>
Skype: jmlccdmd
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