[Users] Extremely poor disk access speeds in Windows guest

[Sanjay Rao]

Adding Bob Sibley to this thread. 

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

> From: "Steve Dainard" <sdainard at miovision.com>
> To: "Andrew Cathrow" <acathrow at redhat.com>
> Cc: "Ronen Hod" <rhod at redhat.com>, "users" <users at ovirt.org>, "Sanjay Rao"
> <srao at redhat.com>, "Itamar Heim" <iheim at redhat.com>
> Sent: Friday, January 24, 2014 3:01:25 PM
> Subject: Re: [Users] Extremely poor disk access speeds in Windows guest

> Not sure what a good method to bench this would be, but:

> An NFS mount point on virt host:
> [root at ovirt001 iso-store]# dd if=/dev/zero of=test1 bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 3.95399 s, 104 MB/s

> Raw brick performance on gluster server (yes, I know I shouldn't write
> directly to the brick):
> [root at gluster1 iso-store]# dd if=/dev/zero of=test bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 3.06743 s, 134 MB/s

> Gluster mount point on gluster server:
> [root at gluster1 iso-store]# dd if=/dev/zero of=test bs=4k count=100000
> 100000+0 records in
> 100000+0 records out
> 409600000 bytes (410 MB) copied, 19.5766 s, 20.9 MB/s

> The storage servers are a bit older, but are both dual socket quad core
> opterons with 4x 7200rpm drives.

> I'm in the process of setting up a share from my desktop and I'll see if I
> can bench between the two systems. Not sure if my ssd will impact the tests,
> I've heard there isn't an advantage using ssd storage for glusterfs.

> Does anyone have a hardware reference design for glusterfs as a backend for
> virt? Or is there a benchmark utility?

> Steve Dainard
> IT Infrastructure Manager
> Miovision | Rethink Traffic
> 519-513-2407 ex.250
> 877-646-8476 (toll-free)

> Blog | LinkedIn | Twitter | Facebook
> Miovision Technologies Inc. | 148 Manitou Drive, Suite 101, Kitchener, ON,
> Canada | N2C 1L3
> This e-mail may contain information that is privileged or confidential. If
> you are not the intended recipient, please delete the e-mail and any
> attachments and notify us immediately.

> On Thu, Jan 23, 2014 at 7:18 PM, Andrew Cathrow < acathrow at redhat.com >
> wrote:

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

> > > 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
> > 
> 
> > > 519-513-2407 ex.250
> > 
> 
> > > 877-646-8476 (toll-free)
> > 
> 

> > > Blog | LinkedIn | Twitter | Facebook
> > 
> 
> > > Miovision Technologies Inc. | 148 Manitou Drive, Suite 101, Kitchener,
> > > ON,
> > > Canada | N2C 1L3
> > 
> 
> > > This e-mail may contain information that is privileged or confidential.
> > > If
> > > you are not the intended recipient, please delete the e-mail and any
> > > attachments and notify us immediately.
> > 
> 

> > > 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 *
> > > > 
> > > 
> > 
> 

> > > > > ______________________________ _________________
> > > > 
> > > 
> > 
> 
> > > > > Users mailing list
> > > > 
> > > 
> > 
> 
> > > > > Users at ovirt.org
> > > > 
> > > 
> > 
> 
> > > > > http://lists.ovirt.org/ mailman/listinfo/users
> > > > 
> > > 
> > 
> 

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> > 
> 
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> 
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> > 
> 
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> > 
> 

-- 
Sanjay Rao 
Principal Performance Engineer Phone: 978-392-2479 
Red Hat, Inc. FAX: 978-392-1001 
314 Littleton Road Email: srao at redhat.com 
Westford, MA 01886 
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