[DRBD-user] split brain on both nodes
adamw at matrixscience.com
Wed Oct 17 11:35:23 CEST 2018
Yesterday I rebooted both nodes a couple of times (replacing BBU RAID
batteries) and ended up with:
drbd0: Split-Brain detected but unresolved, dropping connection!
//0:r0/0 StandAlone Primary/Unknown UpToDate/DUnknown /srv/test1 ext4
3.6T 75G 3.4T 3% /
node2: /drbd-overview //
//0:r0/0 StandAlone Secondary/Unknown UpToDate/DUnknown/
I understand there is a good chance (but not absolute guarantee) that
node1 holds consistent and up to date data.
Is it reasonably possible to mount /dev/drbd0 (/dev/sdb1) on node2 in
read only mode?
I would like to examine the data before discarding and syncing
everything from node1.
/drbdadm disconnect all//
//drbdadm -- --discard-my-data connect all/
Will the above completely purge all data on node2 or just drbd metadata?
I.e. will all 75G have to be fully copied block by block or a lot less?
I'm concerned about time and impact on performance when it comes to
terabytes of data.
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