[Users] Extremely poor disk access speeds in Windows guest

Sat Jan 25 02:46:25 UTC 2014

Steve,

What is the CPU load of the GlusterFS host when comparing the raw brick test to the gluster mount point test? Give it 30 seconds and see what top reports. You’ll probably have to significantly increase the count on the test so that it runs that long.

- Nick

From: Sanjay Rao
Sent: ‎Friday‎, ‎January‎ ‎24‎, ‎2014 ‎3‎:‎35‎ ‎PM
To: Steve Dainard
Cc: Bob Sibley, oVirt Mailing List, Ronen Hod

Adding Bob Sibley to this thread. 

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)

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Miovision Technologies Inc. | 148 Manitou Drive, Suite 101, Kitchener, ON, Canada | N2C 1L3
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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 *

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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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