"The requested size is not a multiple of 1MB" error for vCloud Availability placeholder independent disks repeat in the events view of the vSphere Client

Products

• VMware Cloud Director

Issue/Introduction

Symptoms:

• In the Events view of the vSphere Client, you see entries similar to:

A general system error occurred: The requested size is not a multiple of 1MB

• In the vCloud Availability Portal, all replications are in a healthy state.
• In /var/log/vmware/vpxd/vpxd.log on the vCenter Server appliance, you see entries similar to:

2019-12-11T09:03:58.174Z info vpxd[04804] [Originator@6876 sub=Default opID=########-####-####-####-########d926_sp_Bq-1b] [VpxLRO] -- ERROR task-11029 -- virtualDiskManager -- vim.VirtualDiskManager.createVirtualDisk: vmodl.fault.System
Error:
--> Result:
--> (vmodl.fault.SystemError) {
-->    faultCause = (vmodl.MethodFault) null,
-->    faultMessage = <unset>,
-->    reason = "The requested size is not a multiple of 1MB"
-->    msg = "A general system error occurred: The requested size is not a multiple of 1MB"
--> }
--> Args:
-->
--> Arg name:
--> "[xxx-vvol] rbd4122.########-####-####-####-########87b6/C4-########-####-####-####-########ffbf (########-####-####-####-########e5be)_changed.vmdk"
--> Arg datacenter:
--> 'vim.Datacenter:datacenter-b'
--> Arg spec:
--> (vim.VirtualDiskManager.FileBackedVirtualDiskSpec) {
-->    diskType = "thin",
-->    adapterType = "lsiLogic",
-->    capacityKb = 14676417,
-->    profile = <unset>,
-->    crypto = (vim.encryption.CryptoSpec) null

• This issue occurs if you are using a Virtual Volumes datastore in the destination site.

Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

Environment

VMware vCloud Availability 3.5.x

Resolution

This is a known issue affecting the placeholder disk management in vCloud Availability 3.x.
Currently there is no resolution.

Note: This behaviour does not impact the synchronization of data and the replica disks are not impacted.

Additional Information

For more information on VVols, see the Virtual Volumes Datastores section of the vSphere documentation.

Impact/Risks:
This issue occurs when resizing the placeholder independent disks in vCloud Director, the disk size is set to a value that is not a multiple of 1MB on a VVol datastore.

vCloud Availability increases and decreases the placeholder independent disks based on changes to the replica and point in time instance disk sizes in the destination site. These changes do not always round to a multiple of 1MB.