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
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