[Users] Extremely poor disk access speeds in Windows guest

[Andrew Cathrow]

Are we sure that the issue is the guest I/O - what's the raw performance on the host accessing the gluster storage? 

----- Original Message -----

> From: "Steve Dainard" <sdainard at miovision.com>
> To: "Itamar Heim" <iheim at redhat.com>
> Cc: "Ronen Hod" <rhod at redhat.com>, "users" <users at ovirt.org>, "Sanjay
> Rao" <srao at redhat.com>
> Sent: Thursday, January 23, 2014 4:56:58 PM
> Subject: Re: [Users] Extremely poor disk access speeds in Windows
> guest

> I have two options, virtio and virtio-scsi.

> I was using virtio, and have also attempted virtio-scsi on another
> Windows guest with the same results.

> Using the newest drivers, virtio-win-0.1-74.iso.

> Steve Dainard
> IT Infrastructure Manager
> Miovision | Rethink Traffic
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> On Thu, Jan 23, 2014 at 4:24 PM, Itamar Heim < iheim at redhat.com >
> wrote:

> > On 01/23/2014 07:46 PM, Steve Dainard wrote:
> 

> > > Backing Storage: Gluster Replica
> > 
> 
> > > Storage Domain: NFS
> > 
> 
> > > Ovirt Hosts: CentOS 6.5
> > 
> 
> > > Ovirt version: 3.3.2
> > 
> 
> > > Network: GigE
> > 
> 
> > > # of VM's: 3 - two Linux guests are idle, one Windows guest is
> > 
> 
> > > installing updates.
> > 
> 

> > > I've installed a Windows 2008 R2 guest with virtio disk, and all
> > > the
> > 
> 
> > > drivers from the latest virtio iso. I've also installed the spice
> > > agent
> > 
> 
> > > drivers.
> > 
> 

> > > Guest disk access is horribly slow, Resource monitor during
> > > Windows
> > 
> 
> > > updates shows Disk peaking at 1MB/sec (scale never increases) and
> > > Disk
> > 
> 
> > > Queue Length Peaking at 5 and looks to be sitting at that level
> > > 99%
> > > of
> > 
> 
> > > the time. 113 updates in Windows has been running solidly for
> > > about
> > > 2.5
> > 
> 
> > > hours and is at 89/113 updates complete.
> > 
> 

> > virtio-block or virtio-scsi?
> 
> > which windows guest driver version for that?
> 

> > > I can't say my Linux guests are blisteringly fast, but updating a
> > > guest
> > 
> 
> > > from RHEL 6.3 fresh install to 6.5 took about 25 minutes.
> > 
> 

> > > If anyone has any ideas, please let me know - I haven't found any
> > > tuning
> > 
> 
> > > docs for Windows guests that could explain this issue.
> > 
> 

> > > Thanks,
> > 
> 

> > > *Steve Dainard *
> > 
> 

> > > ______________________________ _________________
> > 
> 
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> > 
> 
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> > 
> 
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> > 
> 

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