[pve-devel] ceph replication speed

[Michael Rasmussen]

On Mon, 30 Dec 2013 14:58:20 +0000
Martin Maurer <martin at proxmox.com> wrote:

> > we just notices a big write speed difference when replication size differs:
> > 
> > size = 2: 100MB/s
> > size = 3:  60MB/s
> 
> After removing one OSD per node (now we have only 1 OSD per host, Seagate Constellation ES.3 4TB, journal on the same), we have:
> 
> size = 2: 55 MB/s
> size = 3: 41 MB/s
> 
> I will add three OSDs on each host - (as soon as I got the disks here) and I expect more speed.
> But the difference between the replication of 2 or 3 is not totally clear to me.
> 
Maybe something to be inspired by:
http://www.sebastien-han.fr/blog/2012/08/26/ceph-benchmarks/
http://hal.archives-ouvertes.fr/docs/00/78/90/86/PDF/a_survey_of_dfs.pdf

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