How to climb vm, after failure of 2 nodes out of 3, running on GlusterFS ?

[Alexandre Aguirre]

Hello guys !

I'm doing some labs with storage glusterfs, in the tests I have 3 nodes, everything working perfectly, but I had a problem simulating the failure of 2 nodes, the vm doesn't start because it's not able to recognize the datastore......... .I'm still new to GlusterFS, if anyone can help me I'll be grateful!

Follows images:

 

[fiona]

Hi,
your Proxmox VE cluster is not quorate (see here) and thus read-only if two out of of three nodes are down.

 

[Alexandre Aguirre]

Hi,
your Proxmox VE cluster is not quorate (see here) and thus read-only if two out of of three nodes are down.

Hello good day !

Thanks for the feedback, could you just help me out? I read the documentation that you gave me, but I didn't understand it very well, because even though I was running pvecm expected 1, it still didn't work.............. Would it refer to QDevice?

 

[fiona]

You should not run pvecm expected 1, because the two offline nodes won't see the changes to the cluster state - making it inconsistent! If you are running a 3-node cluster, at least 2 nodes need to be up for the cluster to work. If that is not possible, you shouldn't use a cluster. A QDevice only makes sense for an even-sized cluster.

 

[Alexandre Aguirre]

You should not run pvecm expected 1, because the two offline nodes won't see the changes to the cluster state - making it inconsistent! If you are running a 3-node cluster, at least 2 nodes need to be up for the cluster to work. If that is not possible, you shouldn't use a cluster. A QDevice only makes sense for an even-sized cluster.

Thanks for the quick turnaround!

So in this case, if I lose 2 nodes, I won't be able to somehow temporarily raise my vm?

 

[fiona]

Thanks for the quick turnaround!

So in this case, if I lose 2 nodes, I won't be able to somehow temporarily raise my vm?

Yes, because the cluster won't be quorate from PVE/Corosync's perspective.

 

[Alexandre Aguirre]

Yes, because the cluster won't be quorate from PVE/Corosync's perspective.

Thank you very much for the clarification!