[Users] Extremely poor disk access speeds in Windows guest

[Steve Dainard]

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 <http://miovision.com/> | *Rethink Traffic*
519-513-2407 ex.250
877-646-8476 (toll-free)

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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 <http://miovision.com/> | *Rethink Traffic*
> 519-513-2407 ex.250
> 877-646-8476 (toll-free)
>
> *Blog <http://miovision.com/blog>  |  **LinkedIn
> <https://www.linkedin.com/company/miovision-technologies>  |  Twitter
> <https://twitter.com/miovision>  |  Facebook
> <https://www.facebook.com/miovision>*
> ------------------------------
>  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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