NetWorker: Disk devices unmounting intermittently

Summary: This article describes a condition resulting from using NFS mounts for Advanced File Type Devices with many clients.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.
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Symptoms

  • Intermittent unmounting of disk-based devices with errors:
    nsrd NSR warning: Operation on device 'device' failed: cannot read adv_file label: Resource temporarily unavailable
    nsrd NSR info media warning: device opening: Cannot read identifier for device 'device': Resource temporarily unavailable 
  • Saves already in progress proceed and complete.
  • New saves are rejected Device requires manual remounting.

 

Cause

This issue may be caused by using NFS shares as Advanced File Device paths used by many Client Direct backups concurrently.

During each save operation, an NFS mount is performed in the background to accommodate Client Direct and traditional Storage Node-based backups. Too many clients using the same path concurrently can overwhelm the host in some cases, causing it to reject further connections.

Resolution

To address the root cause, review the NFS and OS configuration for the export host limitations with its NFS exports.

From a NetWorker standpoint - spreading the devices between different NFS mounts can help alleviate the condition on the host.

Affected Products

NetWorker

Products

NetWorker Family
Article Properties
Article Number: 000348349
Article Type: Solution
Last Modified: 13 مارس 2026
Version:  1
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