Hi Adam,
You only have 3 osd in ceph cluster?
What about journals? Are they inline or in a separate (ssd?) disk?
What about network? Do you have an phisically independent network for
proxmox/vms and ceph?
We have a currently 6-osd 3-node ceph cluster; doing an out/in of a
osd, doesn't create a very high impact. If you in a new osd (replace a
disk) the impact is noticeable but our ~30 vms were yet workable. We do
have different physicall networks for proxmox/VMs and ceph. (1gbit)
Cheers
Eneko
On 28/10/14 16:03, Adam Thompson wrote:
I'm seeing ridiculous I/O latency after out'ing and re-in'ing a disk
in the CEPH array; the OSD monitor tab shows two OSDs (i.e. disks)
having latency above 10msec - they're both in the 200ms range - but
reading a single uncached sector from a virtual disk takes >10sec.
It's bad enough that all my virtualized DNS servers are timing out and
this, of course, directly impacts service.
During normal (non-rebuild, non-rebalance) operations, CEPH is not
terribly fast to write, but delivers acceptable read speeds.
Where do I start looking for problems? Are there any knobs I should
be tweaking for CEPH?
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Binovo IT Human Project, S.L.
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