Hey Greg,
I didn't know that option, but I'm always careful to downgrade and
upgrade the OSDs one by one and wait for the cluster to report healthy
again before proceeding to the next, so, as you said, chances of losing
data should have been minimal. Will flush the journals too next time.
Thanks!
Regards,
Oliver
On do, 2013-08-22 at 14:52 -0700, Gregory Farnum wrote:
> On Thu, Aug 22, 2013 at 2:47 PM, Oliver Daudey <oliver@xxxxxxxxx> wrote:
> > Hey Greg,
> >
> > Thanks for the tip! I was assuming a clean shutdown of the OSD should
> > flush the journal for you and have the OSD try to exit with it's
> > data-store in a clean state? Otherwise, I would first have to stop
> > updates a that particular OSD, then flush the journal, then stop it?
>
> Nope, clean shutdown doesn't force a flush as it could potentially
> block on the filesystem. --flush-journal is a CLI option, so you would
> turn off the OSD, then run it with that option (it won't join the
> cluster or anything, just look at and update local disk state), then
> downgrade the binary.
> In all likelihood this won't have caused you to lose any data because
> in many/most situations the OSD actually will have written out
> everything in the journal to the local FS before you tell it to shut
> down, and as long as one of the other OSDs either did that or turned
> back on without crashing then it will propagate the newer updates to
> everybody. But wiping the journal without flushing is certainly not
> the sort of thing you should get in the habit of doing.
> -Greg
> Software Engineer #42 @ http://inktank.com | http://ceph.com
>
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