On Mon, 12 Dec 2016 22:41:41 +0100 Kevin Olbrich wrote: > Hi, > > just in case: What happens when all replica journal SSDs are broken at once? > That would be bad, as in BAD.
In theory you just "lost" all the associated OSDs and their data. In practice everything but in the in-flight data at the time is still on the actual OSDs (HDDs), but it's inconsistent and inaccessible as far as Ceph is concerned. So with some trickery and an experienced data-recovery Ceph consultant you _may_ get things running with limited data loss/corruption, but that's speculation and may be wishful thinking on my part. Another data point to deploy only well known/monitored/trusted SSDs and have a 3x replication. > The PGs most likely will be stuck inactive but as I read, the journals just > need to be replaced (http://ceph.com/planet/ceph-recover-osds-after-ssd- > journal-failure/). > > Does this also work in this case? > Not really, no. The above works by having still a valid state and operational OSDs from which the "broken" one can recover. Christian -- Christian Balzer Network/Systems Engineer ch...@gol.com Global OnLine Japan/Rakuten Communications http://www.gol.com/ _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
