Thanks for your reply! I am using erasure coded profile with k=5, m=3 settings
$ ceph osd erasure-code-profile get profile5by3 crush-device-class= crush-failure-domain=host crush-root=default jerasure-per-chunk-alignment=false k=5 m=3 plugin=jerasure technique=reed_sol_van w=8 Cluster has 8 nodes, with 3 disks each. We are planning to add 2 more on each nodes. If I understand correctly, then I can add 3 disks at once right , assuming 3 disks can fail at a time as per the ec code profile. Karun Josy On Tue, Dec 5, 2017 at 12:06 AM, David Turner <drakonst...@gmail.com> wrote: > Depending on how well you burn-in/test your new disks, I like to only add > 1 failure domain of disks at a time in case you have bad disks that you're > adding. If you are confident that your disks aren't likely to fail during > the backfilling, then you can go with more. I just added 8 servers (16 > OSDs each) to a cluster with 15 servers (16 OSDs each) all at the same > time, but we spent 2 weeks testing the hardware before adding the new nodes > to the cluster. > > If you add 1 failure domain at a time, then any DoA disks in the new nodes > will only be able to fail with 1 copy of your data instead of across > multiple nodes. > > On Mon, Dec 4, 2017 at 12:54 PM Karun Josy <karunjo...@gmail.com> wrote: > >> Hi, >> >> Is it recommended to add OSD disks one by one or can I add couple of >> disks at a time ? >> >> Current cluster size is about 4 TB. >> >> >> >> Karun >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >
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