[DRBD-user] split brain detected when switching back to the 2node cluster from the DR node

[guohuai li]

Hi,
 
There are several items such as below in /etc/drbd.conf.
You may need to study it.
 
My DRBD is 8.3.0.
It works well.
 
edward
 
#after-sb-0pri disconnect;
after-sb-0pri "discard-older-primary";
 
#after-sb-1pri disconnect;
after-sb-1pri discard-secondary; 
 
> Date: Tue, 4 Aug 2009 18:58:15 +0200
> From: pierre.lebrech at laposte.net
> To: drbd-user at lists.linbit.com
> Subject: [DRBD-user] split brain detected when switching back to the 2node cluster from the DR node
> 
> Hello,
> 
> I always get a split brain when I switch the HA services back to the 2node cluster from my DR node.
> 
> Here are the steps I follow :
> 
> - HA services are on the DR node
> - I stop these HA services
> - I umount the data
> 
> The state of DRBD on node3 is as follow :
> 
> ------------------------------
> version: 8.3.2 (api:88/proto:86-90)
> GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by root at hcns1, 2009-08-04 09:41:09
> 
> 1: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r----
> ns:0 nr:34083396 dw:34084032 dr:68168163 al:12 bm:2094 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:208
> ------------------------------
> 
> Then, on node1 :
> 
> - drbdadm primary r0
> - I start the HA IP
> - drbdadm --stacked up r0-U
> 
> At this point, every thing is OK. Here is the output of cat /proc/drbd :
> 
> ------------------------------
> version: 8.3.2 (api:88/proto:86-90)
> GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by root at hans1, 2009-08-04 09:43:39
> 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate C r----
> ns:13706 nr:174 dw:15096 dr:102401147 al:30 bm:2170 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
> 1: cs:Connected ro:Secondary/Primary ds:UpToDate/UpToDate C r----
> ns:0 nr:244 dw:244 dr:416 al:0 bm:9 lo:0 pe:0 ua:0 ap:0 ep:1 wo:d oos:0
> ------------------------------
> 
> Then, I set all things back (reset) :
> 
> on node1 :
> 
> - drbdadm --stacked down r0-U
> - drbdadm secondary r0
> - I stop the HA IP
> 
> The state on node1 is as follow :
> 
> ------------------------------
> version: 8.3.2 (api:88/proto:86-90)
> GIT-hash: dd7985327f146f33b86d4bff5ca8c94234ce840e build by root at hans1, 2009-08-04 09:43:39
> 0: cs:Connected ro:Secondary/Secondary ds:UpToDate/UpToDate C r----
> ns:13707 nr:174 dw:15097 dr:102401147 al:30 bm:2186 lo:0 pe:0 ua:0 ap:0 ep:1 wo:f oos:0
> 1: cs:Unconfigured
> ------------------------------
> 
> on node3, I type these commands to reset the state :
> 
> - drbdadm secondary r0-U
> 
> Then, on node1 and node2, I start heartbeat normally.
> 
> 
> 
> Well, each time I follow theses steps, node3 gets a split-brain.
> 
> Where is the problem?
> 
> 
> 
> 
> context : 3-node cluster, every node connected, HA services on node1, DRBD version 8.3.2 on linux 2.6.30.
> 
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user

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