Problem Description
During a Linux guest OS File-Level Restore (FLR) on Nutanix AHV, the restore job completes successfully, but the following error message is generated in the system logs or the Druva administration console:
some input/output error occurred while mounting
This issue typically occurs during granular restore testing where a specific single volume fails to mount, causing the restore process to appear incomplete in the UI despite the successful recovery of data files.
Cause
The volume triggering the mount failure is a Linux Swap partition.
Swap partitions function strictly as virtual memory and do not contain persistent data or a standard file system architecture meant for granular recovery.
When the Druva proxy attempts to map and mount all available disk structures during the Nutanix AHV FLR process, the mount call on the swap space naturally fails.
Note: This error message is a cosmetic, known UI limitation specific to the Nutanix AHV integration. It does not indicate data loss, data corruption, or a functional failure of actual data volumes.
Resolution
No corrective action is required. The data restore itself is entirely successful.
Data Integrity Verified: Confirm that all actual data-bearing volumes (e.g.,
ext4,XFS,NTFS) restored successfully. The error can be safely disregarded as it only impacts the non-data swap partition.Expected Behavior: This error is a cosmetic side-effect when Nutanix AHV processes swap space during an FLR.
Hypervisor Difference: This behavior is unique to the Nutanix AHV integration framework. In contrast, VMware ESXi environments quietly exclude swap partitions during file-level browsing. Your primary data remains fully intact and recovered.