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Yeah, usually with Zabbix, nagios has some great scripts: https://github.com/nbuchwitz/check_pve

Easiest way is to look at ceph dashboard inside proxmox.

You didnt specify ssds models, i would like that before any recommendation about ceph.

Why didn;t you just restart it every night at 1?

Use Influx v1 or v2 ,usually it depends on pre-built dashboard on grafana. v3 is lets say opensource, but cripppled, so we are waiting for influx v1 or v2 fork in the future.

As for storage-replication , HA is working yes ,but automatic failover isn't because it is not a HA storage, and as you can see you can lose the data versus regular HA storage(CEPH etc)> .

I'll answer some misconceptions from Johannes, and give some recommendations: 1) CEPH demands 3+ nodes, with more than 100tb data i would recommend probably 5-7-9 nodes. So out of your scope. 2) Clustering doesnt add complexity since it is already included, and adding quorom nodes is just fine...

I usually work with Duplicati on linux/windows workstation. It is really easy gui, with numerous restore options.

Strange and interesting idea. I would use CEPH for that, it seems that it would suit better. i've never seen single node zfs pool with that size on one machine in Proxmox. But if you stick 20x20tb drives in Raidz2/3 i guess you could do it. And replication only works on ZFS, not on LVM...

Thats why i sad, do the backups, and afterwards just delete CEPH and reinstall it.

If you have more monitors do not restart them before backing all up!

Are the backups working? Do all VM/CTs backups if they are.

Just delete that monitor from other nodes, and start clean.

Can you log onto proxmox and ceph on other 3 nodes?

Only way to preserve is to use CEPH.

You can plug out usb after it boots?

No, this is not the point of cluster. You are searching of something like parallel-processing cluster, which is much-much more complex

For 3-node CEPH, anything more than 10g is probably overkill. And since it is only 3 nodes, everything should be on them, and daily or even something like more than few backups per day just in case. Everything should work really fine.

But gluster is EOL,or soon to be, just so you know it.

wrt turion processor, i would just spin up openmediavault for a simple file-share machine.