What is your min_size in the cache pool? If your min_size is 2, then the cluster would block requests to that pool due to it having too few copies available.
PS - Please don't consider using rep_size 2 in production. On Wed, Nov 1, 2017 at 5:14 AM Eugen Block <[email protected]> wrote: > Hi experts, > > we have upgraded our cluster to Luminous successfully, no big issues > so far. We are also testing cache tier with only 2 SSDs (we know it's > not recommended), and there's one issue to be resolved: > > Evertime we have to restart the cache OSDs we get slow requests with > impacts on our client VMs. We never restart both SSDs at the same > time, of course, so we are wondering why the slow requests? What > exactly is happening with a replication size of 2? We assumed that if > one SSD is restarted the data is still available on the other disc, we > didn't expect any problems. But this occurs everytime we have to > restart them. Can anyone explain what is going on there? We could use > your expertise on this :-) > > Best regards, > Eugen > > -- > Eugen Block voice : +49-40-559 51 75 > <+49%2040%205595175> > NDE Netzdesign und -entwicklung AG fax : +49-40-559 51 77 > <+49%2040%205595177> > Postfach 61 03 15 > D-22423 Hamburg e-mail : [email protected] > > Vorsitzende des Aufsichtsrates: Angelika Mozdzen > Sitz und Registergericht: Hamburg, HRB 90934 > Vorstand: Jens-U. Mozdzen > USt-IdNr. DE 814 013 983 > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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