Hi Megov, you should weight the OSD so it's represent the size (like an weight of 3.68 for an 4TB HDD). cephdeploy do this automaticly.
Nevertheless also with the correct weight the disk was not filled in equal distribution. For that purposes you can use reweight for single OSDs, or automaticly with "ceph osd reweight-by-utilization". Udo On 14.01.2015 16:36, Межов Игорь Александрович wrote: > > Hi! > > > We have a small production ceph cluster, based on firefly release. > > > It was built using hardware we already have in our site so it is not > "new & shiny", > > but works quite good. It was started in 2014.09 as a "proof of > concept" from 4 hosts > > with 3 x 1tb osd's each: 1U dual socket Intel 54XX & 55XX platforms on > 1 gbit network. > > > Now it contains 4x12 osd nodes on shared 10Gbit network. We use it as > a backstore > > for running VMs under qemu+rbd. > > > During migration we temporarily use 1U nodes with 2tb osds and already > face some > > problems with uneven distribution. I know, that the best practice is > to use osds of same > > capacity, but it is impossible sometimes. > > > Now we have 24-28 spare 2tb drives and want to increase capacity on > the same boxes. > > What is the more right way to do it: > > - replace 12x1tb drives with 12x2tb drives, so we will have 2 nodes > full of 2tb drives and > > other nodes remains in 12x1tb confifg > > - or replace 1tb to 2tb drives in more unify way, so every node will > have 6x1tb + 6x2tb drives? > > > I feel that the second way will give more smooth distribution among > the nodes, and > > outage of one node may give lesser impact on cluster. Am I right and > what you can > > advice me in such a situation? > > > > > Megov Igor > yuterra.ru, CIO > me...@yuterra.ru > > > _______________________________________________ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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