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sonalg
Contributor
Contributor

"Cannot compute changes for disk " error for disk attached after first snapshot

Hi,

I 'm facing this error when we call queryChangedDiskAreas with changeID as '*' for a disk attached to a VM (which already had a snapshot and then deleted).

Steps:

Vm has one disk D1. Take snapshot and note ChangeID1 for D1.

Delete snapshot.

Attach new disk D2.

Take snapshot.

call queryChangedDiskAreas with changeID as 'ChangeID1 '  for D1. Returns success

call queryChangedDiskAreas with changeID as '*'  for  D2. Returns Unable to retrieve queryChangedDiskAreas : FileFault Exception

New disk D2 , had CBT enabled when it was created.

Here is error in ESX hostd.log

2018-09-20T11:05:02.724Z [53EC2B70 error 'Vmsvc.vm:/vmfs/volumes/9baf0124-30ff66fd/TestVM/TestVM.vmx' opID=48545664-e3 user=vpxuser] Cannot compute changes for disk /vmfs/volumes/9baf0124-30ff66fd/TestVM/TestVM_1-000002.vmdk: Unknown change epoch.

Is this known issue?

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