[Gluster-users] Performance for KVM images (qcow)

[Eyal Marantenboim]

Thanks for you help!
I'll need to figure out a way to recreate the volume as replica 2 without
messing with the running vms.




On Wed, Apr 10, 2013 at 7:25 PM, Bryan Whitehead <driver at megahappy.net>wrote:

> I just want to say that trying to run a VM on almost any glusterfs
> mounted fuse is going to suck when using 1G nic cards.
>
> That said your setup looks fine except you need to change "replica 4"
> to "replica 2". I'm assuming you want redundancy and speed.
> Replicating to all 4 bricks is probably not what you wanted. By
> setting replica to 2 you'll be able to lose any 1 of the 4 bricks and
> still run without data missing.
>
> gluster volume create replica 2 <... list all 4 bricks>
>
>
>
> On Tue, Apr 9, 2013 at 3:49 AM, Stephan von Krawczynski
> <skraw at ithnet.com> wrote:
> > On Tue, 09 Apr 2013 03:13:10 -0700
> > Robert Hajime Lanning <lanning at lanning.cc> wrote:
> >
> >> On 04/09/13 01:17, Eyal Marantenboim wrote:
> >> > Hi Bryan,
> >> >
> >> > We have 1G nics on all our servers.
> >> > Do you think that changing our design to distribute-replicate will
> >> > improve the performance?
> >> >
> >> > Anything in the gluster performance settings that you think I should
> change?
> >>
> >> With GlusterFS, almost all the processing is in the client side.  This
> >> includes replication.  So, when you have "replica 4", the client will be
> >> duplicating all transactions 4 times, synchronously.  Your 1G ethernet
> >> just became 256M.
> >
> > Let me drop in that no clear mind does it this way. Obviously one would
> give
> > the client more physical network cards, best choice as many as there are
> > replications, and do the subnetting accordingly.
> >
> > --
> > Regards,
> > Stephan
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