The virtual disk is either corrupt or not a format supported.

We have a 2008 R2 SP1 VM Datacenter we cannot snapshot.

A manual snapshot of in the Client vSphere indicates the following in the tasks and events:

The virtual disk is either corrupt or not a format supported.

Our NetBackup software is automatic snapshots for VM backups and generates these three errors in the tasks and events:

Cannot run a snapshot operation

Operation timed out

A general error occurred: VMX protocol error.

The virtual machine has two virtual disks:

[vmds-standard: (1) default] outhostname/ourhostname - 000001.vmdk

[vmds-standard: (1) default] outhostname/outhostname_1 - 000001.vmdk

Virtual disk files seem to be the usual file names. Instead, they resemble snapshot files or something similar.

I don't know what is happening. Can anyone help?

The file names are correct, since there is an active snapshot on the virtual computer. I found a few entries in the log file that we/you can see:

08:01:25.543 Mar 23: vmx | DICT scsi0:2.deviceType = scsi-disk hard
08:01:25.543 Mar 23: vmx | DICT scsi0:3.deviceType = scsi-disk hard

There are some entries of old/orphaned for already deleted virtual disks! However, it should ask the question.

21:13:06.212 25 March: vmx | In SUMMARY: SnapshotBranch failed: changes, followed by target file already exists (5).

That's what I think is related to the question. For me, it looks like a problem once with block change tracking, which may have left orphans. What I would do, is first of all to delete all the .ctk files in the folder of the virtual machine on the data store (they will be recreated, only the next incremental/differential backup will take more time). If this is not enough, you can try to disable - at least temporarily - CBT for the virtual machine or remove the virtual machine to inventory, delete the .ctk files and then add it to the inventory...

André

Tags: VMware

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