>>> Digimer <[email protected]> schrieb am 20.03.2019 um 18:47 in Nachricht <[email protected]>: > On 2019-03-20 1:46 p.m., Valentin Vidic wrote: >> On Wed, Mar 20, 2019 at 01:34:52PM -0400, Digimer wrote: >>> Depending on your fail-over tolerances, I might add NFS to the mix and >>> have the NFS server run on one node or the other, exporting your ext4 FS >>> that sits on DRBD in single-primary mode. >>> >>> The failover (if the NFS host died) would look like this; >>> >>> 1. Lost node is fenced. >>> 2. DRBD is promoted from Secondary to Primary >>> 3. ext4 FS is mounted. >>> 4. Virtual IP (used for NFS) is brought up. >>> 5. NFS starts >>> >>> Startup and graceful migration would be the same, minus the fence. >> >> Would it be possible for DRBD to go into SplitBrain if the lost node >> manages to write something to local DRBD disk before it gets fenced? > > Not when DRBD is configured correctly. You sent 'fencing
Are your really saying that dual-primary no longer needs operator intervention after a node crash? That's also split-brain to me if DRBD does not know how to recover after a link interruption. > resource-and-stonith;' and set the appropriate fence handler. This tells > DRBD to not proceed with a write while a node is in an unknown state > (which happens when the node stops responding and is cleared on > successful fence). > > -- > Digimer > Papers and Projects: https://alteeve.com/w/ > "I am, somehow, less interested in the weight and convolutions of > Einstein’s brain than in the near certainty that people of equal talent > have lived and died in cotton fields and sweatshops." - Stephen Jay Gould > _______________________________________________ > Manage your subscription: > https://lists.clusterlabs.org/mailman/listinfo/users > > ClusterLabs home: https://www.clusterlabs.org/ _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/
