Hi Yannis, Thanks for the information you provided.
On pve1, I have initiate the cluster and add the node pve2. When the drbdctrl is primary on pve1 (secondary on pve2) and I shutdown the pve2, the drbd storage is available. I can do any manipulation and even the VM is working. But on the other side, if I shutdown pve1 (where drbdctrl is primary), the drbd storage is not available on pve2. Moreover, any drbdmanage commands (lists-nodes, volumes etc..) does not work on pve2. it says: root@pve2:~# drbdmanage list-nodes Waiting for server: ............... No nodes defined The log goes as follows: Mar 14 13:39:39 pve2 drbdmanaged[20776]: INFO Leader election by wait for connections Mar 14 13:39:39 pve2 drbdmanaged[20776]: INFO DrbdAdm: Running external command: drbdsetup wait-connect-resource --wait-after-sb=yes --wfc-timeout=2 .drbdctrl Mar 14 13:39:41 pve2 drbdmanaged[20776]: ERROR DrbdAdm: External command 'drbdsetup': Exit code 5 Mar 14 13:39:41 pve2 drbdmanaged[20776]: ERROR drbdsetup/stderr: degr-wfc-timeout has to be shorter than wfc-timeout Mar 14 13:39:41 pve2 drbdmanaged[20776]: ERROR drbdsetup/stderr: degr-wfc-timeout implicitly set to wfc-timeout (2s) Mar 14 13:39:41 pve2 drbdmanaged[20776]: ERROR drbdsetup/stderr: outdated-wfc-timeout has to be shorter than degr-wfc-timeout Mar 14 13:39:41 pve2 drbdmanaged[20776]: ERROR drbdsetup/stderr: outdated-wfc-timeout implicitly set to degr-wfc-timeout (2s) Mar 14 13:39:41 pve2 drbdmanaged[20776]: WARNING Resource '.drbdctrl': wait-connect-resource not finished within 2 seconds Regarding the Split Brain issue, I can't find in the log that a split brain situation has been detected on survival node ie pve2 for the moment. I have done a drbdmanage primary drbdctrl but still the drbd storage is not available. How can I resolve the split brain manually so as the drbd storage continues to work even if pve1 (primary is down). I will try to test the scenario by adding a third drbd node (pve3) to the cluster (drbdmanage add-node command) on pve1 and I will let you know. Thanks Shafeek On Mon, Mar 13, 2017 at 10:41 PM, Yannis Milios <yannis.mil...@gmail.com> wrote: > >the drdb storage becomes unavailable >and the drbd quorum is lost.. > > From my experience using only 2 nodes on drbd9 does not work well, meaning > that the cluster loose quorum and you have to manually troubleshoot the > split brain. > If you really need a stable system, then use 3 drbd nodes. You could > possibly use the 3rd node as a drbd control node only ?? Just guessing... > > Yannis > -- > Sent from Gmail Mobile > -- Shafeek SUMSER
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