[DRBD-user] Split Brain, help!

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

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

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 
Aug 16 11:52:18 drbd1: peer 
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!



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