<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_extra"><div class="gmail_quote">On Sat, Jan 25, 2014 at 7:01 AM, Steve Dainard <span dir="ltr"><<a href="mailto:sdainard@miovision.com" target="_blank">sdainard@miovision.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Not sure what a good method to bench this would be, but:<div>
<br></div><div>An NFS mount point on virt host:</div><div><div>[root@ovirt001 iso-store]# dd if=/dev/zero of=test1 bs=4k count=100000</div><div>100000+0 records in</div>
<div>100000+0 records out</div><div>409600000 bytes (410 MB) copied, 3.95399 s, 104 MB/s</div></div><div><br></div><div>Raw brick performance on gluster server (yes, I know I shouldn't write directly to the brick):</div>
<div><div>[root@gluster1 iso-store]# dd if=/dev/zero of=test bs=4k count=100000</div><div>100000+0 records in</div><div>100000+0 records out</div><div>409600000 bytes (410 MB) copied, 3.06743 s, 134 MB/s</div></div><div>
<br>
</div><div>Gluster mount point on gluster server:</div><div><div>[root@gluster1 iso-store]# <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline"></div>dd if=/dev/zero of=test bs=4k count=100000</div>
<div>100000+0 records in</div><div>100000+0 records out</div><div>409600000 bytes (410 MB) copied, 19.5766 s, 20.9 MB/s</div>
</div><div><br></div><div>The storage servers are a bit older, but are both dual socket quad core opterons with 4x 7200rpm drives. </div><div><br></div><div>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.</div>
<div><br></div><div>Does anyone have a hardware reference design for glusterfs as a backend for virt? Or is there a benchmark utility?</div></div></blockquote><div><br></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif">
Check this thread out, <a href="http://raobharata.wordpress.com/2012/10/29/qemu-glusterfs-native-integration/" style="font-family:arial">http://raobharata.wordpress.com/2012/10/29/qemu-glusterfs-native-integration/</a> it's quite dated but I remember seeing similar figures. </div>
<div class="gmail_default" style="font-family:tahoma,sans-serif"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif">In fact when I used FIO on a libgfapi mounted VM I got slightly faster read/write speeds than on the physical box itself (I assume because of some level of caching). On NFS it was close to half.. You'll probably get a little more interesting results using FIO opposed to dd</div>
</div><div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="gmail_extra">
<div class="im"><br clear="all"><div><div dir="ltr"><span style="font-family:arial,sans-serif;font-size:16px"><strong>Steve Dainard </strong></span><span style="font-size:12px"></span><br>
<span style="font-family:arial,sans-serif;font-size:12px">IT Infrastructure Manager<br>
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<br><br></div><div><div class="h5"><div class="gmail_quote">On Thu, Jan 23, 2014 at 7:18 PM, Andrew Cathrow <span dir="ltr"><<a href="mailto:acathrow@redhat.com" target="_blank">acathrow@redhat.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div><div style="font-size:10pt;font-family:arial,helvetica,sans-serif">Are we sure that the issue is the guest I/O - what's the raw performance on the host accessing the gluster storage?<br><br><hr><blockquote style="padding-left:5px;font-size:12pt;font-style:normal;margin-left:5px;font-family:Helvetica,Arial,sans-serif;text-decoration:none;font-weight:normal;border-left-width:2px;border-left-style:solid;border-left-color:rgb(16,16,255)">
<b>From: </b>"Steve Dainard" <<a href="mailto:sdainard@miovision.com" target="_blank">sdainard@miovision.com</a>><br><b>To: </b>"Itamar Heim" <<a href="mailto:iheim@redhat.com" target="_blank">iheim@redhat.com</a>><br>
<b>Cc: </b>"Ronen Hod" <<a href="mailto:rhod@redhat.com" target="_blank">rhod@redhat.com</a>>, "users" <<a href="mailto:users@ovirt.org" target="_blank">users@ovirt.org</a>>, "Sanjay Rao" <<a href="mailto:srao@redhat.com" target="_blank">srao@redhat.com</a>><br>
<b>Sent: </b>Thursday, January 23, 2014 4:56:58 PM<br><b>Subject: </b>Re: [Users] Extremely poor disk access speeds in Windows guest<div><div><br><br><div dir="ltr">I have two options, virtio and virtio-scsi.<div>
<br></div><div>I was using virtio, and have also attempted virtio-scsi on another Windows guest with the same results.</div><div><br></div><div>Using the newest drivers, virtio-win-0.1-74.iso.</div>
</div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><span style="font-family:arial,sans-serif;font-size:16px"><strong>Steve Dainard </strong></span><span style="font-size:12px"></span><br>
<span style="font-family:arial,sans-serif;font-size:12px">IT Infrastructure Manager<br>
<a href="http://miovision.com/" target="_blank">Miovision</a> | <em>Rethink Traffic</em><br>
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<br><br><div class="gmail_quote">On Thu, Jan 23, 2014 at 4:24 PM, Itamar Heim <span dir="ltr"><<a href="mailto:iheim@redhat.com" target="_blank">iheim@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div>On 01/23/2014 07:46 PM, Steve Dainard wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
Backing Storage: Gluster Replica<br>
Storage Domain: NFS<br>
Ovirt Hosts: CentOS 6.5<br>
Ovirt version: 3.3.2<br>
Network: GigE<br>
# of VM's: 3 - two Linux guests are idle, one Windows guest is<br>
installing updates.<br>
<br>
I've installed a Windows 2008 R2 guest with virtio disk, and all the<br>
drivers from the latest virtio iso. I've also installed the spice agent<br>
drivers.<br>
<br>
Guest disk access is horribly slow, Resource monitor during Windows<br>
updates shows Disk peaking at 1MB/sec (scale never increases) and Disk<br>
Queue Length Peaking at 5 and looks to be sitting at that level 99% of<br>
the time. 113 updates in Windows has been running solidly for about 2.5<br>
hours and is at 89/113 updates complete.<br>
</blockquote>
<br></div>
virtio-block or virtio-scsi?<br>
which windows guest driver version for that?<br>
<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div>
<br>
I can't say my Linux guests are blisteringly fast, but updating a guest<br>
from RHEL 6.3 fresh install to 6.5 took about 25 minutes.<br>
<br>
If anyone has any ideas, please let me know - I haven't found any tuning<br>
docs for Windows guests that could explain this issue.<br>
<br>
Thanks,<br>
<br>
<br></div>
*Steve Dainard *<br>
<br>
<br>
<br>
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