Hi, On 17/06/2015 18:04, Garg, Pankaj wrote: > Hi, > > > > I have 5 OSD servers, with total of 45 OSDS in my clusters. I am trying out > Erasure Coding with different K and m values. > > I seem to always get Warnings about : Degraded and Undersized PGs, whenever I > create a profile and create a Pool based on that profile. > > I have profiles with K and M value pairs : (2,1), (3,3) and (5,3).
By default the crush ruleset for an erasure coded pool needs as many hosts as k+m. I.e. you need 6 hosts for (3,3) and 8 for (5,3). You can change this by setting the failure domain when creating the erasure code profile as documented at http://docs.ceph.com/docs/master/rados/operations/erasure-code-jerasure/ > > What would be appropriate PG values? I have tried from as low as 12 to 1024 > and always get the Degraded and Undersized PGs. This is quite confusing. > > If the problem is different, it would be great if you could file a bug report with details. The ceph report command will output all the relevant information. Cheers > > Thanks > > Pankaj > > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Loïc Dachary, Artisan Logiciel Libre
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