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Slow agent-based backups of XEN guests - Connect IT Community | Kaseya
<main> <article class="userContent"> <h2 data-id="issue"><strong>ISSUE</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> <h2 data-id="resolution"><strong>RESOLUTION</strong></h2> <p></p> <p>The recommendation from XenServer Support is to disable ALL Offloading (<a rel="nofollow" href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Funitrends-support.zendesk.com%2Fhc%2Fen-us%2Farticles%2F360013250278%3Fq%3DSELECT%2BArticleNumber%252CId%252CSummary%252CResolution__c%252CAttachment__Body__s%252CCause__c%252CNotes__c%252CAttachment__ContentType__s%252CAttachment__Length__s%252CAttachment__Name__s%252CTitle%252CKnowledgeArticleId%252CDescription__c%2Bfrom%2BArticle__kav%2Bwhere%2BPublishStatus%253D%2527Online%2527">File Level Slow Backup Performance on Xen Guest Windows Operating System</a> recommends disabling the Large Send Offload however, that by itself may not make enough of a difference). </p> <p>If you have Powershell 3.x or above you can run the powershell command:</p> <pre class="code codeBlock" spellcheck="false" tabindex="0"> Disable-NetAdapterChecksumOffload -Name * </pre> <p>This will hit all adapters and all relevant settings. You can confirm your success with the corresponding</p> <pre class="code codeBlock" spellcheck="false" tabindex="0"> get-NetAdapterChecksumOffload</pre> <p> (Microsoft powershell <a rel="nofollow" href="/home/leaving?allowTrusted=1&target=https%3A%2F%2Fdocs.microsoft.com%2Fen-us%2Fpowershell%2Fmodule%2Fnetadapter%2Fdisable-netadapterchecksumoffload">https://docs.microsoft.com/en-us/powershell/module/netadapter/disable-netadapterchecksumoffload</a>)</p> <h2 data-id="cause"><strong>CAUSE</strong></h2> <p>Offloading causes performance drops when the Xen virtual machine is not being actively used for non-backup tasks. </p> </article> </main>