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<p class="MsoNormal">If I create a preallocated disk for a VM, I see the disk image file listing as the size I requested (100G):<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">cd /rhev/data-center/mnt/storage_host1:_vol_pa1__nas__01b__oVirt__prod__01/53560d43-874a-49c5-9c5a-8b90487c79f8/images/d97f7706-3662-40bf-9358-80e0dc51bff4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">root@ovirt_host> ls -l<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">total 105064644<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">-rw-rw---- 1 vdsm kvm 107374182400 Aug 5 10:57 75c14559-e18f-4cc8-a3fe-bc0de507720b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">-rw-rw---- 1 vdsm kvm 1048576 Aug 5 10:57 75c14559-e18f-4cc8-a3fe-bc0de507720b.lease<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">-rw-r--r-- 1 vdsm kvm 313 Aug 5 10:57 75c14559-e18f-4cc8-a3fe-bc0de507720b.meta<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">and the corresponding space used on disk matches<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">root@ ovirt_host > du -sh *<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">101G 75c14559-e18f-4cc8-a3fe-bc0de507720b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">1.1M 75c14559-e18f-4cc8-a3fe-bc0de507720b.lease<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">4.0K 75c14559-e18f-4cc8-a3fe-bc0de507720b.meta<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If I then migrate that storage (while the VM is shutdown) to a new storage domain, the size on disk does not match the allocated size. In this case there is nothing in the disk yet so it shows as 0.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">cd /rhev/data-center/mnt/storage_host2:_vol_pa1__ovirt__uatprod/1f2c2b48-1e77-4c98-a6da-5dc09b78cead/images/d97f7706-3662-40bf-9358-80e0dc51bff4<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">root@ ovirt_host> ls -l<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">total 1032<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">-rw-rw---- 1 vdsm kvm 107374182400 Aug 5 11:06 75c14559-e18f-4cc8-a3fe-bc0de507720b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">-rw-rw---- 1 vdsm kvm 1048576 Aug 5 11:06 75c14559-e18f-4cc8-a3fe-bc0de507720b.lease<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">-rw-r--r-- 1 vdsm kvm 313 Aug 5 11:06 75c14559-e18f-4cc8-a3fe-bc0de507720b.meta<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">root@ ovirt_host > du -sh *<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">0 75c14559-e18f-4cc8-a3fe-bc0de507720b<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">1.1M 75c14559-e18f-4cc8-a3fe-bc0de507720b.lease<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Courier New",serif">4.0K 75c14559-e18f-4cc8-a3fe-bc0de507720b.meta<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">oVirt still lists the disk as preallocated in the GUI but it is in fact thin provisioned.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I see the same issue if I clone a preallocated VM. The size on disk ends up being the equivalent of a thin-provisioned disk. I also had the issue when importing VM’s from an export domain when I had selected preallocated in the import dialog
box.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Is this a known issue? Should preallocated not mean preallocated on physical disk?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Ovirt Engine is running 3.6.4.1-1.el6<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The ovirt nodes are running: <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">OS Version: RHEL - 7 - 2.1511.el7.centos.2.10<o:p></o:p></p>
<p class="MsoNormal">Kernel Version: 3.10.0 - 327.4.5.el7.x86_64<o:p></o:p></p>
<p class="MsoNormal">KVM Version: 2.3.0 - 31.el7_2.7.1<o:p></o:p></p>
<p class="MsoNormal">LIBVIRT Version: libvirt-1.2.17-13.el7_2.2<o:p></o:p></p>
<p class="MsoNormal">VDSM Version: vdsm-4.17.23.2-0.el7.centos<o:p></o:p></p>
<p class="MsoNormal">SPICE Version: 0.12.4 - 15.el7<o:p></o:p></p>
<p class="MsoNormal">GlusterFS Version: [N/A]<o:p></o:p></p>
<p class="MsoNormal">CEPH Version: librbd1-0.80.7-3.el7<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Many thanks,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Simon<o:p></o:p></p>
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