[PVE-User] Ceph: PANIC or DON'T PANIC? ;-)

Marco Gaiarin gaio at sv.lnf.it
Tue Nov 29 15:05:14 CET 2016


Mandi! Alwin Antreich
  In chel di` si favelave...

> What does the following command give you?
> ceph osd pool get <POOLNAME> min_size

root at capitanamerica:~# ceph osd pool get DATA min_size
min_size: 1
root at capitanamerica:~# ceph osd pool get VM min_size
min_size: 1
root at capitanamerica:~# ceph osd pool get LXC min_size
min_size: 1


> As a general thought, a HA cluster would be always running, so the event that you shutdown all nodes is unlikely to
> happen.

Ahem, not so unlikely... we have UPSes but not diesel generators... ;-(


> And if you decide to shutdown all nodes, then a couple of minutes should be ok to get everything running again
> and ceph needs its time, till all services are running.

This is not the case. I've started the nodes one by one...

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