As far as Ceph is concerned, as long as there are no separate journal/blockdb/wal devices, you absolutely can transfer osds between hosts. If there are separate journal/blockdb/wal devices, you can do it still, provided they move with the OSDs. With Nautilus and up, make sure the osd bootstrap key is on the new host, and run 'ceph-volume lvm scan --all'. It will scan through the devices, identify the ceph osds et al and start them on the new host. There are no other "gotchas" that I remember. I cannot speak to Proxmox, however. -- Adam On Sat, Apr 11, 2020 at 12:45 PM Jarett DeAngelis <jarett@reticulum.us> wrote:
This is an edge case and probably not something that would be done in production, so I suspect the answer is “lol, no,” but here goes:
I have three nodes running Nautilus courtesy of Proxmox. One of them is a self-built Ryzen 5 3600 system, and the other two are salvaged i5 Skylake desktops that I have pressed into service as virtualization and storage nodes. I want to replace the i5 systems with machines that are identical to the Ryzen 5 system. What I want to know is whether it’s possible to just take the devices that are currently hosting the OSDs, together with the hard drive that is hosting Proxmox, move them into the new machine, power up and have everything working. I don’t *think* the device names should change. What does everything think about this possibly insane plan? (Yes, I will back up all my important data before trying this.)
Thanks, J _______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io