On Thu, Nov 1, 2012 at 6:00 PM, Dietmar Maurer <dietmar@xxxxxxxxxxx> wrote: > I always thought a distributed block storage could do such things > faster (or at least as fast) than a single centralized store? That rather depends on what makes up each of them. ;) On Thu, Nov 1, 2012 at 6:11 AM, Alexandre DERUMIER <aderumier@xxxxxxxxx> wrote: > I have some customers with some huge databases (too big to be handle in the bufer), require a lot of ios. (around 10K). > > I have redone tests with 4 guest in parallel, I get 4 x 5000iops, so it seem to scale ! (and cpu is very low on the ceph cluster). > > > So I'll try some tricks, like raid over multiple rbd devices, maybe it'll help. Did your RAID setup improve anything? Have you tried scaling past 4 guests in parallel? I still haven't come up with a good model for what could be causing these symptoms. :/ -Greg -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
