Problem:
We have a server in which some Virtual Machines (VM) are running on VMware Esxi 5.5. In these Virtual Machines, we have RHEL 5.8, RHEL 6.8, Windows Server 2003, and Windows Server 2008 R2. One day suddenly Windows Server 2008 R2 stopped working and we were not able to take the console or remote of that VM. When we have not found any solution then we have tried to reboot that VM but it not starting and was showing the error “Failed to start the virtual machine. Module DiskEarly power on failed. Cannot open the disk ‘/vmfs/volumes/52b66ab4-8c801b45-fd7a-a0d3c10119c0/BACKUPSERVER/BACKUPSERVER_8.vmdk’ or one of the snapshot disks it depends on.19 (No such device)“.
Reason:
A LUN from SAN was mapped with this VM through RAW Device Mapping for backup of some data. During some activity on SAN, we unmapped that LUN from VM because that was no more required. So VM was giving the disk error for this LUN while we were trying to start the VM.
Solution:
To remove the above error we need to remove the disk (which was mapped from the SAN) from the VM and after removing the disk VM will start successfully.
- Right-click on the Virtual Machine (VM) and click on the Edit Settings.
- Identify the disk from the error log, in my case, it is BACKUPSERVER_8.vmdk which is Hard disk 5.
- Select the Hard Disk 5 and click on the Manage Path button it will give you the error message “There is no multiparty configuration for this LUN” because this LUN is no more mapped anywhere.
- Select the Hard Disk 5 and click on the Remove button to remove this LUN from this Virtual Machine.
- Click on the OK button.
- Now start the Virtual Machine and it will start without any error or warning.
