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Backup failed: One or more disks for this virtual machine are unsupported. - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="summary"><strong>SUMMARY</strong></h2> <p>This article provides instructions for resolving VMware backup failures caused by unsupported disks.</p> <h2 data-id="issue"><strong>ISSUE</strong></h2> <p>Using a third party tool to convert a VHD (Hyper-V) to a VMDK (VMware) can result in a VMDK with a provisioning type that is not supported by VMware. Attempts to back up these disks on a Unitrends appliance fail with the following error: <i>Backup failed: One or more disks for this virtual machine are unsupported</i>. <br><br> </p> <h2 data-id="resolution"><strong>RESOLUTION</strong></h2> <p>To resolve this error: </p> <ul><li>Ensure that the VMDKs use one of the following provisioning types supported by VMware: <ul><li>Thick Provision Lazy Zeroed</li> <li>Thick Provision Eager Zeroed</li> <li>Thin Provision</li> </ul></li></ul><br>The recommended option for resolving this error is to change the provisioning type for the converted disk. For instructions, see the VMware article <a rel="nofollow" href="/home/leaving?allowTrusted=1&target=http%3A%2F%2Fkb.vmware.com%2Fselfservice%2Fmicrosites%2Fsearch.do%3Flanguage%3Den_US%26cmd%3DdisplayKC%26externalId%3D2014832">Changing the thick or thin provisioning of a virtual disk</a>. If the original VHD is still available, you can also resolve the issue by redoing the conversion. See the attached article for details.<h2 data-id="notes"><strong>NOTES</strong></h2> <p>For more detailed information on backup failures and performance issues see <a rel="nofollow" href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Funitrends-support.zendesk.com%2Fhc%2Fen-us%2Farticles%2F360013174757">Unitrends KB 5062 - Backup Failures and Performance Issues</a></p> </article> </main>