>>That full system slows down, OK, but brutal stop... This is strange, that could be: - qemu crash, maybe a bug in rbd block storage (if you use librbd) - oom-killer on you host (any logs ?) what is your qemu version ? ----- Mail original ----- De: "Florent Bautista" <florent@xxxxxxxxxxx> À: "ceph-users" <ceph-users@xxxxxxxxxxxxxx> Envoyé: Lundi 16 Mars 2015 10:11:43 Objet: Re: Changing pg_num => RBD VM down ! Of course but it does not explain why VMs stopped... That full system slows down, OK, but brutal stop... On 03/14/2015 07:00 PM, Andrija Panic wrote: changin PG number - causes LOOOT of data rebalancing (in my case was 80%) which I learned the hard way... On 14 March 2015 at 18:49, Gabri Mate < mailinglist@xxxxxxxxxxxxxxxxxxx > wrote: BQ_BEGIN I had the same issue a few days ago. I was increasing the pg_num of one pool from 512 to 1024 and all the VMs in that pool stopped. I came to the conclusion that doubling the pg_num caused such a high load in ceph that the VMs were blocked. The next time I will test with small increments. On 12:38 Sat 14 Mar , Florent B wrote: > Hi all, > > I have a Giant cluster in production. > > Today one of my RBD pools had the "too few pgs" warning. So I changed > pg_num & pgp_num. > > And at this moment, some of the VM stored on this pool were stopped (on > some hosts, not all, it depends, no logic) > > All was running fine for months... > > Have you ever seen this ? > What could have caused this ? > > Thank you. > > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com -- Andrija Panić _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com BQ_END _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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