Lost OSD units in 5 node cluster

[alebusta]

Hello, I am new in the forum, I looked for information about my problem without success

I have a 5 node cluster, which was hacked and all nodes were lost. The OSD distributed disk system remains intact. My question is it possible in a new installation of the cluster with the 5 nodes, to remount these OSD units together with their pools?
Proxmox VE 6.4
Grateful for your help, best regards
Alejandro

 

[Stoiko Ivanov]

If all your system disks are 'lost' and the ceph-mon databases were stored on those than the chances of recovering data are limited.

I think if the OSDs were encrypted the data is lost (unless you still have the monitors)

Else - the ceph documentation is quite good and explains the steps - make sure to have backups in case something goes wrong (e.g. make disk-images of each OSD):
https://docs.ceph.com/en/latest/rados/troubleshooting/troubleshooting-mon/#monitor-store-failures

I hope this helps and good luck!