<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,102,0)">Hi. Sorry to reply to my own post, but I guess I need to follow up with a simpler question.</div><div class="gmail_default" style="font-family:verdana,sans-serif;color:rgb(0,102,0)">
<br>Is anyone here running a VM with libvirt, KVM, a raw LVM disk and has it set up with type='block' and target bus='virtio' ?</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Tue, Mar 5, 2013 at 12:51 PM, Jeff Dickens <span dir="ltr"><<a href="mailto:jeff@seamanpaper.com" target="_blank">jeff@seamanpaper.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div class="gmail_default" style="color:rgb(0,102,0)"><font face="verdana, sans-serif"><br clear="all"></font></div>
<div><font face="verdana, sans-serif"><br></font></div><font face="verdana, sans-serif">-- <br>
<font><div style="color:rgb(0,102,0);display:inline" class="gmail_default"></div></font><span style="line-height:15px;background-color:rgb(235,236,228)">Hi. I'm running <div style="color:rgb(0,102,0);display:inline" class="gmail_default">
Ubuntu Precise </div>12.04 LTS. I created some virtual machines using vmbuilder, and then migrated those from their .qcow files to lvm. However, those virtual machines are still using disk type "file":</span><br style="line-height:15px;background-color:rgb(235,236,228)">
</font><div style="line-height:15px;background-color:rgb(235,236,228);margin:5px 20px 20px;padding:0px"><div style="margin:0px;padding:0px"><font face="verdana, sans-serif">Code:</font></div>
<pre style="margin-top:0px;margin-bottom:0px;padding:6px;line-height:14px;border:1px inset;overflow:scroll;direction:ltr;background-image:none;background-color:rgb(239,239,239);min-height:108px;background-repeat:repeat no-repeat">
<font face="verdana, sans-serif"> <disk type='file' device='disk'>
<driver name='qemu' type='raw'/>
<source file='/dev/vg1/lvname'/>
<target dev='hda' bus='ide'/>
<alias name='ide0-0-0'/>
<address type='drive' controller='0' bus='0' unit='0'/>
</disk></font></pre></div><font face="verdana, sans-serif"><span style="line-height:15px;background-color:rgb(235,236,228)">Now I've noticed that this disk should probably have type "block" - using this is supposed to provide superior performance. It would also make Berteaud's virt-backup script happy and willing to snapshot the lvm making the backup very quick. So I tried setting up the disk like this:</span><br style="line-height:15px;background-color:rgb(235,236,228)">
<br style="line-height:15px;background-color:rgb(235,236,228)"></font><div style="line-height:15px;background-color:rgb(235,236,228);margin:5px 20px 20px;padding:0px"><div style="margin:0px;padding:0px">
<font face="verdana, sans-serif">Code:</font></div><pre style="margin-top:0px;margin-bottom:0px;padding:6px;line-height:14px;border:1px inset;overflow:scroll;direction:ltr;background-image:none;background-color:rgb(239,239,239);min-height:96px;background-repeat:repeat no-repeat">
<font face="verdana, sans-serif"><disk type='block' device='disk'>
<driver name='qemu' type='raw'/>
<source dev='/dev/vg1/lvname'/>
<target dev='vda' bus='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
</disk></font></pre></div><font face="verdana, sans-serif"><span style="line-height:15px;background-color:rgb(235,236,228)">I had to edit fstab to look for the disk on vda instead of hda but it came up. However performance was terrible. It seemed like it was going to lock up, although it never did.</span><br style="line-height:15px;background-color:rgb(235,236,228)">
<br style="line-height:15px;background-color:rgb(235,236,228)"><span style="line-height:15px;background-color:rgb(235,236,228)">So my question<div style="color:rgb(0,102,0);display:inline" class="gmail_default">
is:</div></span><span style="line-height:15px;background-color:rgb(235,236,228)"> <div style="color:rgb(0,102,0);display:inline" class="gmail_default"></div><b>How should I be setting up my LVM-based virtual machines to use virtio block devices ?</b></span><br>
<br style="line-height:15px;background-color:rgb(235,236,228)"><font><br></font><font> IT Manager <a href="tel:978-632-1513" value="+19786321513" target="_blank">978-632-1513</a></font><br><img src="http://www.seamanpaper.com/seamanlogo.jpg" width="200" height="45"><div style="font-family:verdana,sans-serif;color:rgb(0,102,0);display:inline" class="gmail_default">
</div></font><br>
</div>
</blockquote></div><br><br clear="all"><div><br></div>-- <br><font><b><span style="font-family:trebuchet ms,sans-serif"> Jeff Dickens</span></b><br style="font-family:trebuchet ms,sans-serif"></font><font><span style="font-family:trebuchet ms,sans-serif"> IT Manager</span> 978-632-1513</font><br>
<img src="http://www.seamanpaper.com/seamanlogo.jpg" width="200" height="45"><br>
</div>