VMDK disk show zero size after snapshot operation
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VMDK disk show zero size after snapshot operation

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Article ID: 344852

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Updated On:

Products

VMware vCenter Server VMware vSphere ESXi

Issue/Introduction

  • After taking a snapshot on a virtual machine, the task completes successfully. However the VM configuration shows the VMDK disk size is "0" (zero).

  • Unable to do any task on the virtual machine.
  • Backup jobs fail for the virtual machine.
  • /var/run/log/hostd.log on the ESXi host has errors similar to:

    2019-12-12T16:02:09.743Z warning hostd[1B4C2B70] [Originator@6876 sub=Vmsvc.vm:/vmfs/volumes/-db5986e0-695f-/x/x.vmx] Snapshot create succeeded, but UID 650 not in list.
    2019-12-12T16:02:09.743Z warning hostd[1B4C2B70] [Originator@6876 sub=Vmsvc.vm:/vmfs/volumes/-db5986e0-695f-/x/x.vmx] Failed operation
    2019-12-12T16:02:09.744Z info hostd[1B4C2B70] [Originator@6876 sub=Vmsvc.vm:/vmfs/volumes/-db5986e0-695f-/x/x.vmx] State Transition (VM_STATE_CREATE_SNAPSHOT -> VM_STATE_ON)
    2019-12-12T16:02:09.744Z info hostd[1B4C2B70] [Originator@6876 sub=Vimsvc.TaskManager] Task Completed : haTask-49-vim.VirtualMachine.createSnapshot-127313764 Status error
    2019-12-12T16:02:09.595Z warning hostd[1B4C2B70] [Originator@6876 sub=Vmsvc.vm:/vmfs/volumes/-db5986e0-695f-/x/x.vmx] UpdateStorageAccessibilityStatusInt: The datastore is not accessible ide1:0.fileName = "/vmfs/volumes/-4df76266-7681-/contentlib--0b4f-4c5b-bc5b-/-4f37-47e9-aa1e-/x.iso"

Environment

  • VMware vSphere ESXi 6.5
  • VMware vSphere ESXi 6.7
  • VMware vSphere ESXi 7.0.x
  • VMware vSphere ESXi 8.0.x

Cause

While virtual machines consist of multiple files, the ESXi host service (hostd) treats them as a single object. If any of the VMs are inaccessible, the virtual machine will be transitioned to an invalid load state.

For example, if an ISO has been attached to the VM and that ISO was moved away from the datastore; or was deleted without removing it from the virtual machine beforehand, the virtual machine will experience the issues described.

Furthermore, when the datastore that the VM is located on becomes inaccessible, hostd will not refresh the disk. Default entries with 0 capacity will be generated for those virtual disks that were not yet cached. In this situation, hostd will not refresh the snapshot list for the VM. As a result, snapshot creation tasks will fail. The snapshot itself is actually getting created, but the system fails to find the new UUID in the list, resulting in the task failing.

Resolution

    1. Ensure that the storage holding the virtual machine files is accessible. Fix any issues preventing its accessibility before continuing.
    2. Reload the virtual machine:
      1. SSH into the ESXi host hosting that virtual machine.
      2. Find the virtual machine ID (VMID): 
        $ vim-cmd vmsvc/getallvms | grep <VM_name>
      3. Reload the virtual machine: 
        $ vim-cmd vmsvc/reload <VMID>
    3. Edit the virtual machine configuration using the vSphere Client and remove any inaccessible ISOs that are attached to it.
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