[pve-devel] UUID for VM's and disks

[Dietmar Maurer]

> Using a pool per cluster will mean that you may need to split/shrink
> your placement group count to stay within Ceph best-practises.  With
> using a fixed number of pools, you can calculate the correct number of
> PG's for your estimated OSD count.
> By using a UUID for the disks and having a shared ceph pool, we would
> be able to move VM's between the PVE clusters to balance around the
> Proxmox clustering limits without fear of overlapping disk ID's.

Another solution would be to restrict VMIDs to certain values,

cluster1: 1XXXXX
cluster2: 2XXXXX
cluster3: 3XXXXX

> Having UUID's for VM's is not as important, but just ensures that 3rd
> party applications are referencing a unique ID for a VM and removes
> the potential for basic coding errors removing a VM from the wrong
> cluster.

I don't really get that. Someone can also remove the wrong UUID?