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

[Eyal Marantenboim]

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?

thanks!


On Tue, Apr 9, 2013 at 6:00 AM, Bryan Whitehead <driver at megahappy.net>wrote:

> This looks like you are replicating every file to all bricks?
>
> What is tcp running on? 1G nics? 10G? IPoIB (40-80G)?
>
> I think you want to have Distribute-Replicate. So 4 bricks with replica =
> 2.
>
> Unless you are running at least 10G nics you are going to have serious
> IO issues in your KVM/qcow2 VM's.
>
> On Mon, Apr 8, 2013 at 7:11 AM, Eyal Marantenboim
> <eyal at theserverteam.com> wrote:
> > Hi,
> >
> >
> > We have a set of 4 gluster nodes, all in replicated (design?)
> >
> > We use it to store our qcow2 images for kvm. These images have a variable
> > IO, though most of them are for reading only.
> >
> >
> > I tried to find some documentation re. performance optimization, but it's
> > either unclear to me, or I couldn't find much.. so I'd copied from the
> > internet and tried to adjust the config to our needs, but I'm sure it's
> not
> > optimized.
> >
> >
> > We're using 3.3.1 on top of XFS.
> >
> > The qcow images are about 30GB (a couple of 100GB).
> >
> >
> > Can someone please tell what would be the best paramenter for
> performance to
> > look at?
> >
> >
> > here is volume info:
> >
> >
> > Volume Name: images
> >
> > Type: Replicate
> >
> > Volume ID:
> >
> > Status: Started
> >
> > Number of Bricks: 1 x 4 = 4
> >
> > Transport-type: tcp
> >
> > Bricks:
> >
> > Brick1: vmhost2:/exports/1
> >
> > Brick2: vmhost3:/exports/1
> >
> > Brick3: vmhost5:/exports/1
> >
> > Brick4: vmhost6:/exports/1
> >
> > Options Reconfigured:
> >
> > performance.cache-max-file-size: 1GB
> >
> > nfs.disable: on
> >
> > performance.cache-size: 4GB
> >
> > performance.cache-refresh-timeout: 1
> >
> > performance.write-behind-window-size: 2MB
> >
> > performance.read-ahead: on
> >
> > performance.write-behind: on
> >
> > performance.io-cache: on
> >
> > performance.stat-prefetch: on
> >
> > performance.quick-read: on
> >
> > performance.io-thread-count: 64
> >
> > performance.flush-behind: on
> >
> > features.quota-timeout: 1800
> >
> > features.quota: off
> >
> >
> > Thanks in advanced.
> >
> >
> > _______________________________________________
> > Gluster-users mailing list
> > Gluster-users at gluster.org
> > http://supercolony.gluster.org/mailman/listinfo/gluster-users
>
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