On Mon, 30 Dec 2013 14:58:20 +0000 Martin Maurer <[email protected]> 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 -- Hilsen/Regards Michael Rasmussen Get my public GnuPG keys: michael <at> rasmussen <dot> cc http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xD3C9A00E mir <at> datanom <dot> net http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE501F51C mir <at> miras <dot> org http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE3E80917 -------------------------------------------------------------- /usr/games/fortune -es says: "Thirty days hath Septober, April, June, and no wonder. all the rest have peanut butter except my father who wears red suspenders."
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