[pve-devel] ceph replication speed

Stefan Priebe s.priebe at profihost.ag
Mon Dec 30 12:37:36 CET 2013


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?
>
>
>
> _______________________________________________
> pve-devel mailing list
> pve-devel at pve.proxmox.com
> http://pve.proxmox.com/cgi-bin/mailman/listinfo/pve-devel
>


More information about the pve-devel mailing list