Migrating PVE install from flash to NVMe

U

unsichtbarre

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Oct 1, 2024
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I did an install where one host of a three host cluster had a dead RAID controller. To reach quorum, I went ahead and installed PVE to a flash drive and joined the cluster for HA failover capacity, however no VMs on that host.

This is a three-host cluster with iSCSI storage.

Now the RAID controller is replaced and I want to move the PVE install from flash to RAID/NVMe. In my mind:
  1. Download /etc
  2. Remove flash media
  3. Re-install PVE to RAID
  4. Upload /etc to new install
  5. Reboot
Am I missing anything?

THX,
-JB
 
Johannes S said:
Another option would be to copy /etc/pve from a zfs or lvm snapshot.
Click to expand...
Did you test that? I know that you know that pve is a fuse-mounted database; a snapshot of the "/"-filesystem is... empty:

Code: 
~# ls -Al /.zfs/snapshot/manual/etc/ | grep pve;  echo "inside pve:"; ls -Al /.zfs/snapshot/manual/etc/pve/
drwxr-xr-x 2 root   root       2 Aug 26  2023 pve
inside pve:
total 0

I can only test with ZFS, but I'm fairly sure the same is true for LVM.


Edit: reading the other posts again I probably missed the point. I'll leave it here nevertheless...
 
Last edited:
UdoB said:
Did you test that? I know that you know that pve is a fuse-mounted database; a snapshot of the "/"-filesystem is... empty:
Click to expand...
Now I feel stupid to miss that. But for the regular /etc/ directory (which OP also wants to backup if I didn't miss something) snapshots would work fine. And for /etc/pve consistency isn't that much of an issue like with the remainder of /etc.
For the goals of the OP I would backup /etc from a snapshot, /etc/pve and (just for good measure /var/lib/pve-cluster (again from a snapshot), since it contains the sqlite database used for the fuse pmcxfs
 
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