Re: ceph performance under xen?

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On Fri, Jun 29, 2012 at 2:06 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote:
> Okay, there's two things I'd do here. First, create a cluster that
> only has one MDS — the multi-MDS system is significantly less stable.

Ok, will do.

> Second, you've got 3 monitors doing frequent fsyncs, and 4 OSDs doing
> frequent syncs, which are all funneling into a single disk. That's
> going to go poorly no matter what you're doing. ;) Try doing a smaller
> cluster with just one monitor, one or two OSDs, and one MDS.

Oh, I missed that part.  The disks on the dom0 are actually logical
volumes on top of a (software) RAID5 with four physical disks.  That
may, of course, not be a better situation. =)

In any case, I'll rebuild the current four machines into one MON, one
MDS and two OSDs and see how that goes.  Thanks for the advice.

Brian.
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