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Affected Versions
Source Hypervisor
Target Hypervisor

How to expand a protected volume to beyond 2TB. (Prevent VPG from “Needs Configuration”)

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As ESXi 5.5.x and 6.0.x do not support hot disk expansion above 2TB. (Volume expansion of a powered on VM). Please see the NOTE below for ESXI 6.5 and above.
The VRA on the target site, which can only perform a hot-expansion, will not be able to expand the disk. Therefore, the protected and mirror volumes will not match in size. For more information on this VMware limitation see:

NOTE: VMware limitation has been changed if the user is running ESXi 6.5 and above versions. Important: Hardware Version 13 (vHW 13) is not required for this to work – therefore just the vSphere platform and not the VM has to be upgraded. By default, expanding a protected volume to a size beyond 2TB will result in the VPG entering "Needs Configuration" state and the VM will have to be re-added. (Results in delta-sync)
An administrator may want to prevent that behavior and enable expanding disks to over 2TB without resulting in unnecessary syncs.


  1. Verify the recovery disk is on a VRA-H and not a VRA. If not on VRA-H:
    1. Open the tweaks.txt file located in the ZVR folder on the ZVM. (Default location is: C:Program FilesZertoZerto Virtual Replication)
    2. Enter the following tweak in a new line: "t_maxDiskboxVolumesAllowedOnVra=0". (Only what's in the quotation marks)
    3. Restart the Zerto service on the ZVM.
    4. Change recovery VRA for the VM and then change back:
      1. On the Zerto GUI, under the "Setup" tab, choose "Change VM Recovery VRA" on the relevant VM.
      2. Select a different VRA and click done.
      3. After a successful change, repeat step 1+2 to revert to the original VRA. (Not a necessity)
  2.  Turn off the VRA-H that has the disk.
  3.  Resize the disk on the protected source VM. 
  4. Wait for the VPG to finish updating. 
  5. Turn on VRA-H.