[pve-devel] ceph replication speed

[Stefan Priebe]

Hi Dietmar,

yes it returns successfull when all replicas are written to journal / 
underlying FS.

Not sure about the performance decrease. But generally ceph only shows 
full performance with lots of parallism.

I don't know your configuration may be your journal speed is limited?

Stefan
Am 30.12.2013 11:59, schrieb Dietmar Maurer:
> Hi all,
>
> we just notices a big write speed difference when replication size differs:
>
> size = 2: 100MB/s
>
> size = 3:  60MB/s
>
> The network is 10GB, so that should not be the limit.
>
> AFAIK ceph uses primary-copy replication, where copies to second and
> third node is done parallel?
>
> So why is that so much slower?
>
>
>
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