Hi David, Thank you for your response.
Failure domain for ec profile is 'host'. So I guess it is okay to add a node and activate 5 disks at a time ? $ 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 Karun Josy On Sun, Dec 17, 2017 at 11:26 PM, David Turner <drakonst...@gmail.com> wrote: > I like to avoid adding disks from more than 1 failure domain at a time in > case some of the new disks are bad. In your example of only adding 1 new > node, I would say that adding all of the disks at the same time is the > better way to do it. > > Adding only 1 disk in the new node at a time would actually be worse for > the balance of the cluster as it would only have 1 disk while the rest have > all 5 or more. > > The EC profile shouldn't play into account as you already have enough > hosts to fulfill it. > > On Sun, Dec 17, 2017, 11:57 AM Karun Josy <karunjo...@gmail.com> wrote: > >> Hi, >> >> We have a live cluster with 8 OSD nodes all having 5-6 disks each. >> >> We would like to add a new host and expand the cluster. >> >> We have 4 pools >> - 3 replicated pools with replication factor 5 and 3 >> - 1 erasure coded pool with k=5, m=3 >> >> So my concern is, is there any precautions that are needed to add the new >> host since the ec profile is 5+3. >> >> And can we add multiple disks at the same time in the new host ? Or >> should it be 1 at a time ? >> >> >> >> Karun >> _______________________________________________ >> ceph-users mailing list >> ceph-users@lists.ceph.com >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >
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