[DRBD-user] Split Brain, help!

Ben Clewett ben at roadrunner.uk.com
Thu Aug 16 13:10:38 CEST 2007



Dead DRBD,

I have never had a problem with DRBD, 8.0.3, until now.

This happened at the same time as I upgraded linux-ha from 2.0.8 to 2.1.2.

Full log attached, this is an exert:

Aug 16 11:52:18 drbd1: Handshake successful: DRBD Network Protocol 
version 86
Aug 16 11:52:18 drbd1: Split-Brain detected, dropping connection!
Aug 16 11:52:18 drbd1: self 
BEDB966CA82D9A19:48FB01456BF4AD01:808C51F368210CB6:32670C5EB0E5BA83
Aug 16 11:52:18 drbd1: peer 
0E52E3C9B428750B:48FB01456BF4AD00:808C51F368210CB6:32670C5EB0E5BA83
Aug 16 11:52:18 drbd1: conn( WFReportParams -> Disconnecting )
Aug 16 11:52:18 drbd1: error receiving ReportState, l: 4!
Aug 16 11:52:18 drbd1: meta connection shut down by peer.
Aug 16 11:52:18 drbd1: asender terminated
Aug 16 11:52:18 drbd1: tl_clear()
Aug 16 11:52:18 drbd1: Connection closed
Aug 16 11:52:18 drbd1: conn( Disconnecting -> StandAlone )

----------

I understand from other postings to this mailing list that I have to 
sacrafice a disk using:

root at bad-data# drbdadm -- --discard-my-data connect all
root at good-data# drbdadm connect all

But this is very worrying.  I would loose my customers data.  I want to 
understand how this happens, and how I can avoid this ever happening again.

Also worring was that linux-ha, using the DRBD supplied heartbeat 
complient script, reported DRBD as up.  Therefore DRBD mounded the bad 
disk and allowed data to write to is.

Any suggestions are very welcome!

Regards,

Ben






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