I have already installed multiple one node ceph cluster with cephfs for non-productive workloads in the last few years. Had no major issue, e.g. once a broken HDD. The question is what kind of EC or replication you will use. Also only powered off the node in a clean and healthy state ;-) What would interest me is, pause the cluster with "ceph osd pause" and send the nodes to hibernate. Joachim Am Mi., 22. Mai 2024 um 07:55 Uhr schrieb Matthias Ferdinand < mf+ml.ceph@mfedv.net>:
On Tue, May 21, 2024 at 08:54:26PM +0000, Eugen Block wrote:
It’s usually no problem to shut down a cluster. Set at least the noout flag, the other flags like norebalance, nobackfill etc won’t hurt either. Then shut down the servers. I do that all the time with test clusters (they do have data, just not important at all), and I’ve never had data loss after powering them back on. When all OSDs are up, unset the flags and let it scrub. Usually, the (deep-)scrubbing will start almost immediately.
One surprise I have with the Ubuntu test cluster (non-containerized, Ubuntu packages) that I regularly shut down is that the signals from log rotation (I assume) to Ceph daemons interfere with Ceph startup. When rebooted after some days, it is the same on all nodes: no Ceph daemon is running. Workaround: another reboot
Matthias
Zitat von "adam.ther" <adam.ther@aol.com>:
Thanks guys,
I think ill just risk it cause it's just for backup, then write something up later as a follow up on what happens in-case others want
do similar. I agree it not typical, im a bit of an odd-duck datahorder.
Regards,
Adam
On 5/21/24 14:21, Matt Vandermeulen wrote:
I would normally vouch for ZFS for this sort of thing, but the mix of drive sizes will be... and inconvenience, at best. You could get creative with the hierarchy (making zraid{2,3} of mirrors of same-sized drives, or something), but it would be far from ideal. I use ZFS for my own home machines however, all the drives are identical.
I'm curious about this application of Ceph though, in home-lab use. Performance likely isn't a top concern, just a durable persistent storage target, so this is an interesting use case.
On 2024-05-21 17:02, adam.ther wrote:
Hello,
It's all non-corperate data, I'm just trying to cut back on wattage (removes around 450W of the 2.4KW) by powering down backup servers that house 208TB while not being backed up or restoring.
ZFS sounds interesting however does it play nice with a mix of drive sizes? That's primarily why I use Ceph, it's okay (if not ideal) with 4x 22TB, 8x 10TB, 10x 4TB.
So that said, would Ceph have any known issues with long power downs aside from it nagging about the scrubbing schedule? Mark i see you said it wouldn't matter but does Ceph not use a date based scheduler?
Thanks,
Adam
On 5/21/24 13:29, Marc wrote:
> > I think it is his lab so maybe it is a test setup for
> Home production? A home setup to test on, before he applies changes to his
to production. production
Saluti 🍷 ;)
_______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
_______________________________________________ ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io
ceph-users mailing list -- ceph-users@ceph.io To unsubscribe send an email to ceph-users-leave@ceph.io