I have one question, what can or can't do a cluster working on degraded mode?
With K=10 + M = 4 if one of my OSDs node fails it will start working on degraded mode, but can I still do writes and reads from that pool? El 23/10/2017 a las 21:01, Ronny Aasen escribió: > On 23.10.2017 20:29, Karun Josy wrote: >> Hi, >> >> While creating a pool with erasure code profile k=10, m=4, I get PG >> status as >> "200 creating+incomplete" >> >> While creating pool with profile k=5, m=3 it works fine. >> >> Cluster has 8 OSDs with total 23 disks. >> >> Is there any requirements for setting the first profile ? > > > you need K+M+X osd nodes. K and M comes from the profile, X is how > many nodes you want to be able to tolerate failure of, without > becoming degraded. (how many failed nodes ceph should be able to > automatically heal) > > so with K=10 + M = 4 you need minimum 14 nodes and you have 0 fault > tolerance (a single failure = a degreded cluster) so you have to > scramble to replace the node to get HEALTH OK again. if you have 15 > nodes you can loose 1 node and cehp will automatically rebalance to > the 14 needed nodes, and you can replace the lost node at your leisure. > > kind regards > Ronny Aasen > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- ------------------------------------------------------------------------ *Jorge Pinilla López* jorp...@unizar.es Estudiante de ingenieria informática Becario del area de sistemas (SICUZ) Universidad de Zaragoza PGP-KeyID: A34331932EBC715A <http://pgp.rediris.es:11371/pks/lookup?op=get&search=0xA34331932EBC715A> ------------------------------------------------------------------------
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