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OD3UNICRON

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Oct 23, 2022
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I have two nodes, both running Proxmox installed on XFS. Is it true that I cannot create a cluster with them?
 
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OD3UNICRON said:
Is it true that I cannot create a cluster with them?
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Well, you can create a cluster with a single node. Actually that's what you do when you bootstrap a cluster ;-)

@spirit already mentioned the manual workaround to administrate a node when the other one is down.

My recommendation is - of course - to add a Quorum Device: https://pve.proxmox.com/pve-docs/chapter-pvecm.html#_corosync_external_vote_support

Note that this QD may be as small as a Raspberry Pi or it may be a VM or a Container running on another system like your NAS. Do not try to run it inside a VM of the cluster itself ;-)
 
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spirit said:
with 2 nodes, you can, but you'll need each time to unlock /etc/pve readonly manually if one of the node goes down. (#pvecm expected 1)

So 3 nodes minimum to keep quorum && write to /etc/pve/ if 1 node goes down
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Thank you, I'm aware of that.
 
UdoB said:
Well, you can create a cluster with a single node. Actually that's what you do when you bootstrap a cluster ;-)

@spirit already mentioned the manual workaround to administrate a node when the other one is down.

My recommendation is - of course - to add a Quorum Device: https://pve.proxmox.com/pve-docs/chapter-pvecm.html#_corosync_external_vote_support

Note that this QD may be as small as a Raspberry Pi or it may be a VM or a Container running on another system like your NAS. Do not try to run it inside a VM of the cluster itself ;-)
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That I know too,
I previously had two nodes clustered, with both nodes running Proxmox installed on ZFS, and encountered no issues. However, I later reinstalled Proxmox on the second node using XFS. When I attempted to cluster them — with the first node on ZFS and the second on XFS — the second node caused issues with my local-lvm; specifically, local-lvm was converted to ZFS during the clustering process.
Now that both nodes are installed on XFS, I am concerned about clustering them.
 
OD3UNICRON said:
That I know too,
I previously had two nodes clustered, with both nodes running Proxmox installed on ZFS, and encountered no issues. However, I later reinstalled Proxmox on the second node using XFS. When I attempted to cluster them — with the first node on ZFS and the second on XFS — the second node caused issues with my local-lvm; specifically, local-lvm was converted to ZFS during the clustering process.
Now that both nodes are installed on XFS, I am concerned about clustering them.
Click to expand...

The added node inherits the cluster(-wide) configuration(s).
Since there was no local-lvm, but only local-zfs, already in the cluster-wide storage configuration: [1], you only had to re-add the local-lvm, after joining the cluster, again (and restrict both to their corresponding node).

Keep in mind, that storage replication: [2] is only available with ZFS on both nodes...

[1] https://pve.proxmox.com/wiki/Storage#_storage_configuration
[2] https://pve.proxmox.com/wiki/Storage_Replication
 
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