[pve-devel] ceph replication speed
aderumier at odiso.com
Mon Dec 30 20:25:28 CET 2013
my 2 cents, but is the crushmap ok ?
(are you sure that replication occur on osd on differents servers )
But indeed, replication is parallel, from first node to others node.
So it shouldn't slow down( of course, if hardware is same everywhere).
----- Mail original -----
De: "Dietmar Maurer" <dietmar at proxmox.com>
À: "Eric Blevins" <eric at netwalk.com>, pve-devel at pve.proxmox.com
Envoyé: Lundi 30 Décembre 2013 18:47:24
Objet: Re: [pve-devel] ceph replication speed
> When you write to only three OSDs, each one replicates to two more OSDs, a
> total of 9 OSD writes.
> Half of the OSDs make two writes, I would expect reduced performance with
> 50% of the OSDs doing twice the work.
Thought a bit more about that, it does not really explain the slowdown. If all 6 OSD writes
the overall throughput should be even better.
Anyway, I will test that.
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