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cluster join: mention that storage config from cluster is inherited

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and what to do about it. It's a rather common topic in forum threads.

Suggested in the community forum:
https://forum.proxmox.com/threads/118492/post-513743

Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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Fiona Ebner 2022-11-30 15:09:34 +01:00 committed by Thomas Lamprecht
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pvecm.adoc
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@ -172,11 +172,14 @@ infrastructure for bigger clusters.
Adding Nodes to the Cluster
---------------------------
CAUTION: A node that is about to be added to the cluster cannot hold any guests.
All existing configuration in `/etc/pve` is overwritten when joining a cluster,
since guest IDs could otherwise conflict. As a workaround, you can create a
backup of the guest (`vzdump`) and restore it under a different ID, after the
node has been added to the cluster.
CAUTION: All existing configuration in `/etc/pve` is overwritten when joining a
cluster. In particular, a joining node cannot hold any guests, since guest IDs
could otherwise conflict, and the node will inherit the cluster's storage
configuration. To join a node with existing guest, as a workaround, you can
create a backup of each guest (using `vzdump`) and restore it under a different
ID after joining. If the node's storage layout differs, you will need to re-add
the node's storages, and adapt each storage's node restriction to reflect on
which nodes the storage is actually available.
Join Node to Cluster via GUI
~~~~~~~~~~~~~~~~~~~~~~~~~~~~