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Question

Commvault 11.40.47 – Backup of Nutanix AHV VMs Fails (Unable to Mount NFS Share)

  • April 14, 2026
  • 2 replies
  • 25 views
T
Novice
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Hello everyone,

I’m facing an issue while backing up production virtual machines hosted on Nutanix AHV using Commvault version 11.40.47, and I would appreciate your guidance.

Environment

  • Commvault Version: 11.40.47
  • Hypervisor: Nutanix AHV
  • Prism Element IP: 10.10.100.120
  • Commvault Access Node / Media Agent:
    • Hostname: srv-CV-backup
    • IP: 10.10.100.24

Issue Description

When starting a backup job:

  • Commvault successfully discovers and lists all the VMs
  • The backup job starts but fails before backing up any disks
  • The issue occurs for all VMs

Error Message

Error opening the disks for virtual machine [Win-SRV1].
Access node [srv-CV-backup] is unable to mount NFS share [10.10.100.120:/PROD].
Source: srv-backup, Process: JobManager

Notes

  • The latest Commvault version available to us is installed (11.40.47)
  • VM discovery works correctly
  • The failure seems related to mounting the NFS datastore from Nutanix

Has anyone encountered a similar issue with Commvault and Nutanix AHV?
Are there any specific NFS permissions, firewall rules, or configuration settings that should be checked on either the Nutanix or Commvault side?

PS: the lastes succesful backup was before going to this AOS version 7.5
also this version is compatible with commvault its mentionned in the docs 
Thank you in advance for your support.

Best regards,

2 replies

J
Vaulter
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  • Jace RossVaulter
  • Vaulter
  • April 14, 2026

Hi Tahait,

I would recommend trying to test mounting the NFS export onto your Access node without Commvault.
If that fails then there’s an issue with NFS mounting, if it succeeds then there may be something else occurring.

I would also suggest checking vsbkp.log on your access node at the time the job fails as you may get more information on the issue.

If your access node is a Linux access node you can also check system logs (dmesg, syslog, messages, etc) for NFS events. In Windows you can check Event Viewer but I’m not certain if it does show NFS attempt failures in its logging. These may also indicate what issues are occurring.


If this doesn’t help narrow down your issue I would recommend raising a support incident so that our support team can investigate further.

Cheers,

Jace Ross, Senior Technical SME
T
Novice
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  • TahaitNovice
  • Author
  • Novice
  • April 15, 2026

Hello,

I have resolved the issue.

The problem was fixed by removing the CommServe (all‑in‑one Access Node) IP address from the filesystem allowlist in Nutanix Prism Element. After removing the IP, I restarted the backup job, and it completed successfully.

Afterward, when I checked Nutanix Prism Element again, I noticed that the allowlist configuration was still present, which was unexpected. However, the backups are now running successfully.

Thank you very much for your support and assistance.

Best regards,

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