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Veeam Availability for Nutanix backup fails after upgrade to AOS 5.8.0.1 or later

KB ID: 2742
Product: Veeam Backup for Nutanix AHV
Version: 1.0.342
Published: 2018-08-31
Last Modified: 2020-08-13
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Challenge

Veeam Availability for Nutanix backup job fails with:

Backup VM [ID: 4a89ffc5-68b3-4be0-b117-0591dcec184e' Name: 'MYVM’] failed. Error: Backup was unsuccessful. Preparing VM for backup failed, 1."

Prism Element dashboard shows the following failed tasks:
User-added image

The following conditions are met:

  1. Nutanix AOS is upgraded up to 5.8.0.1 within STS (Short Term Support) release branch;
  2. Affinity rules are configured for the affected machines:
​​ User-added image

Cause

This is a known Nutanix issue and is tracked by Nutanix as an internal bug ENG-163615 which was discovered after the release of Nutanix AOS 5.6.1.
 

Solution

Upgrade to AOS 5.9.1 where ENG-163615 was resolved.  If an upgrade is not an option, you may disable the host affinity rules for the affected VMs as a workaround.
 
LTS (Long Term Support) release branch is not affected by this issue at the moment.
 
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