Also make sure your PGs per pool and per entire Cluster are correct...
you want 50-100 PGs per OSD total, otherwise performance can be
impacted. Also if the cluster is new, it might take it a little while to
rebalance and be available 100%, at that point speed can be affected too.
Those are a couple issues I had just recently, thought I'd share with
you too.
On 2017-04-06 12:40 AM, Piotr Dałek wrote:
On 04/06/2017 09:34 AM, Stanislav Kopp wrote:
Hello,
I'm evaluate ceph cluster, to see if you can use it for our
virtualization solution (proxmox). I'm using 3 nodes, running Ubuntu
16.04 with stock ceph (10.2.6), every OSD uses separate 8 TB spinning
drive (XFS), MONITORs are installed on the same nodes, all nodes are
connected via 10G switch.
The problem is, on client I have only ~25-30 MB/s with seq. write. (dd
with "oflag=direct"). [..]
8TB size suggest these are some kind of "archive" drives (SMR drives).
Is that correct? If so, you may want to use non-SMR drives, because
Ceph is not optimized for those.
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