[Users] Extremely poor disk access speeds in Windows guest

Wed Jan 29 17:35:38 UTC 2014

On Wed, Jan 29, 2014 at 5:11 AM, Vadim Rozenfeld <vrozenfe at redhat.com>wrote:

> On Wed, 2014-01-29 at 11:30 +0200, Ronen Hod wrote:
> > Adding the virtio-scsi developers.
> > Anyhow, virtio-scsi is newer and less established than viostor (the
> > block device), so you might want to try it out.
>
> [VR]
> Was it "SCSI Controller" or "SCSI pass-through controller"?
> If it's "SCSI Controller" then it will be viostor (virtio-blk) device
> driver.
>
>
"SCSI Controller" is listed in device manager.

Hardware ID's:
PCI\VEN_1AF4&DEV_1004&SUBSYS_00081AF4&REV_00
PCI\VEN_1AF4&DEV_1004&SUBSYS_00081AF4
PCI\VEN_1AF4&DEV_1004&CC_010000
PCI\VEN_1AF4&DEV_1004&CC_0100

>
> > A disclaimer: There are time and patches gaps between RHEL and other
> > versions.
> >
> > Ronen.
> >
> > On 01/28/2014 10:39 PM, Steve Dainard wrote:
> >
> > > I've had a bit of luck here.
> > >
> > >
> > > Overall IO performance is very poor during Windows updates, but a
> > > contributing factor seems to be the "SCSI Controller" device in the
> > > guest. This last install I didn't install a driver for that device,
>
> [VR]
> Does it mean that your system disk is IDE and the data disk (virtio-blk)
> is not accessible?
>

In Ovirt 3.3.2-1.el6 I do not have an option to add a virtio-blk device:
Screenshot here:
https://dl.dropboxusercontent.com/u/21916057/Screenshot%20from%202014-01-29%2010%3A04%3A57.png

VM disk drive is "Red Hat VirtIO SCSI Disk Device", storage controller is
listed as "Red Hat VirtIO SCSI Controller" as shown in device manager.
Screenshot here:
https://dl.dropboxusercontent.com/u/21916057/Screenshot%20from%202014-01-29%2009%3A57%3A24.png

In Ovirt manager the disk interface is listed as "VirtIO".
Screenshot here:
https://dl.dropboxusercontent.com/u/21916057/Screenshot%20from%202014-01-29%2009%3A58%3A35.png

>
> > >  and my performance is much better. Updates still chug along quite
> > > slowly, but I seem to have more than the < 100KB/s write speeds I
> > > was seeing previously.
> > >
> > >
> > > Does anyone know what this device is for? I have the "Red Hat VirtIO
> > > SCSI Controller" listed under storage controllers.
>
> [VR]
> It's a virtio-blk device. OS cannot see this volume unless you have
> viostor.sys driver installed on it.
>

Interesting that my VM's can see the controller, but I can't add a disk for
that controller in Ovirt. Is there a package I have missed on install?

rpm -qa | grep ovirt
ovirt-host-deploy-java-1.1.3-1.el6.noarch
ovirt-engine-backend-3.3.2-1.el6.noarch
ovirt-engine-lib-3.3.2-1.el6.noarch
ovirt-engine-restapi-3.3.2-1.el6.noarch
ovirt-engine-sdk-python-3.3.0.8-1.el6.noarch
ovirt-log-collector-3.3.2-2.el6.noarch
ovirt-engine-dbscripts-3.3.2-1.el6.noarch
ovirt-engine-webadmin-portal-3.3.2-1.el6.noarch
ovirt-host-deploy-1.1.3-1.el6.noarch
ovirt-image-uploader-3.3.2-1.el6.noarch
ovirt-engine-websocket-proxy-3.3.2-1.el6.noarch
ovirt-engine-userportal-3.3.2-1.el6.noarch
ovirt-engine-setup-3.3.2-1.el6.noarch
ovirt-iso-uploader-3.3.2-1.el6.noarch
ovirt-engine-cli-3.3.0.6-1.el6.noarch
ovirt-engine-3.3.2-1.el6.noarch
ovirt-engine-tools-3.3.2-1.el6.noarch

> > >
> > >                 I've setup a NFS storage domain on my desktops SSD.
> > >                 I've re-installed
> > >                 win 2008 r2 and initially it was running smoother.
> > >
> > >                 Disk performance peaks at 100MB/s.
> > >
> > >                 If I copy a 250MB file from a share into the Windows
> > >                 VM, it writes out
> [VR]
> Do you copy it with Explorer or any other copy program?
>

Windows Explorer only.

> Do you have HPET enabled?
>

I can't find it in the guest 'system devices'. On the hosts the current
clock source is 'tsc', although 'hpet' is an available option.

> How does it work with if you copy from/to local (non-NFS) storage?
>

Not sure, this is a royal pain to setup. Can I use my ISO domain in two
different data centers at the same time? I don't have an option to create
an ISO / NFS domain in the local storage DC.

When I use the import option with the default DC's ISO domain, I get an
error "There is no storage domain under the specified path. Check event log
for more details." VDMS logs show "Resource namespace
0e90e574-b003-4a62-867d-cf274b17e6b1_imageNS already registered" so I'm
guessing the answer is no.

I tried to deploy with WDS, but the 64bit drivers apparently aren't signed,
and on x86 I get an error about the NIC not being supported even with the
drivers added to WDS.

> What is your virtio-win drivers package origin and version?
>

virtio-win-0.1-74.iso ->
http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/

>
> Thanks,
> Vadim.
>
>
>
Appreciate it,
Steve
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