[Pacemaker] help with DRBD/pacemaker

Michael Schwartzkopff misch at clusterbau.com
Mon May 13 05:54:19 EDT 2013


I experienced a strange phenomena when setting up DRBD 8.4.2 with pacemaker 

I can set up a dual primary DRBD manually without any problems. Now shut down 
one node, i.e. I demote the DRBD and the shut is "down".

When I start the cluster on the first node everything if fine. The CRM detects 
that the DRBD is promoted. When I start pacemaker in the second cluster node I 

- pacemaker starts DRBD nicely on the second node. It detects the correct 
generation identifiers and the operations start and notify (2x) show success.

Now the cluster wants to promote the second node and it generates a new 
generation identified:
2013-05-13T10:41:44.862939+02:00 xray kernel: block drbd0: role( Secondary -> 
Primary )
2013-05-13T10:41:44.862957+02:00 xray kernel: block drbd0: new current UUID 

Then DRBD starts the connection and DRBD detects the different primary 
generation identifiers. The result is a split brain.

Any idea why DRBD 8.4.2 does not start the network connection when starting 
the DRBD on the second node? Why does the cluster promote the DRBD (and thus 
generating the new GI) WITHOUT the connection between the DRBD?

Thanks for any help.

Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
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