Re: how to debug slow rbd block device

[Greg Farnum <greg@xxxxxxxxxxx>]

What does your test look like? With multiple large IOs in flight we can regularly fill up a 1GbE link on our test clusters. With smaller or fewer IOs in flight performance degrades accordingly. 


On Tuesday, May 22, 2012 at 5:45 AM, Stefan Priebe - Profihost AG wrote:

> Hi list,
> 
> my ceph block testcluster is now running fine.
> 
> Setup:
> 4x ceph servers
> - 3x mon with /mon on local os SATA disk
> - 4x OSD with /journal on tmpfs and /srv on intel ssd
> 
> all of them use 2x 1Gbit/s lacp trunk.
> 
> 1x KVM Host system (2x 1Gbit/s lacp trunk)
> 
> With one KVM i do not get more than 40MB/s and my network link is just
> at 40% of 1Gbit/s.
> 
> Is this expected? If not where can i start searching / debugging?
> 
> Thanks,
> Stefan
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