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Yeah that is true.

Use Raid10 if you want best performance, not any Raidz.

Try without name, maybe it will work. so just: zpool import or: zpool import -f something should work.

not really.

with zfs, just add disks to new installation, and do something like zpool import pool(your pool name) . This should be enough.

Just do the backups again on them,just for peace of mind.

try with qm unlock 102 or 103 on that host(pve2?)

The CEPH is rather specific, because it is a complex software, which can kill your storage pretty fast. That is why i usually recommend bringing 3-node test cluster,and there you can molest it and everything you need, intentionally crash it etc,etc. Then when you see everything ceph can...

Contact support, or hire someone who knows what he is doing.

i would in your case drop GPT and hire and engineer,atleast for a few hours.

you don't need HA.

You have separate public and cluster ceph networks, are they both available? do you have a need for cluster network? if not use just public_network. Also, there are a lot of osds down, i would check the disks if they are working as expected(hddsentinel?) .Moreover, why so many pools? Usually one...

Yes.

Cluster nodes are different from ceph cluster, can you give us images from node/CEPH, if you can from one node,but all views?

2 nodes and a quorom if you don't want full third node.

Usually now (in the west) , you use 3.xTB and 7.xTB ssds or nvmes, and then you can get good density and performance.

Three is okay for start, but those hdd and this use case is a engineer error.

This is not true,if you have 4 nodes, you can only lose one, since 3 is needed for minimum quoroum.

1. Yes 1min is replication time, but you need to spin up machine on a different node when first one dies, right? 2. For ceph, 3 is min and it works great if you have fast disks. With more nodes it is even more great :)

To offload ceph writes to db/wal .