Cohesity backup solution interface missing device mapping for VM disk 2

Products

• VMware vCenter Server

Issue/Introduction

• Cohesity version: 7.2.2 U2 (20250718)

• Under “New Recovery > Virtual Disks” disk one is listed with mapping while disk two is listed but without mapping.

• On every VM experiencing this issue you see disk one as being mapped with mount points, while disk two is listed but with no mount point.

• Restore of VM succeeds and both disks are recovered. Only missing the mount point to access the data for the guest OS.

• Multiple VMs succeeding recovery (not affected) and those that are affected have the same VMtools, VM Hardware version, and same guest OS RHEL build.

• Issue spans across clusters, different storage arrays. Across multiple Cohesity “Protection groups”.

• When looking at previous restore points seeing the same issue for the affected VMs.

• This missing mapping makes it so during recovery both disks are recovered to the restored VM, but the mappings are missing.

• It seems that once the issue started it has continued for the affected VMs.

Environment

Cohesity Backup Solution

vCenter Server

Cause

• Possibly due to something in the environment (e.g., increased storage I/O, communication issues between ESX hosts and storage, etc.) affecting the random VMs.

• Does not appear to be an issue caused by vSphere.

Resolution

• Work with backup storage vendor (Cohesity for this scenario) to confirm next best steps.

  • Cohesity support may need the following.

    • From web browser, generate a HAR log for when accessing the “New Recovery > Virtual Disks” page.

    • Time Capsule logs and copies of vmx files for a couple affected VMs (original and restored).

• Known resolution is to create new full backup of affected VMs.
  
  Note: Doing this will likely cause loss of access to recover from previous older restore points.