> On 19/11/2015, at 23:36 , Haomai Wang <[email protected]> wrote:
> Hmm, what's the actual capacity usage in this volume? Fiemap could
> help a lot to a normal workload volume like sparse data distribution.
I’m using basically the whole volume, so it’s not really sparse.
>
> Hmm, it's really a strange result for me. AFAR, it should be a burst
> bandwidth at least. From my tests, the disk bandwidth is keeping high
> level.
>
> What's your ceph env?
I have two; the production cluster is 9 OSD hosts with Crucial SSDs. It is
where we first observed the performance problem after taking snapshots.
To try and debug the problem I have built a small test cluster using an Intel
S3710 SSD and 3 OSDs in containers on the same host. This is not a very
realistic deployment scenario, but it showed the same performance behaviour
(and I think it eliminates the network latency as a source of problems).
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