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HotAdd Transport Mode does not Work when Attempting to Back Up a VMware VM

Symptom

The HotAdd transport mode is not supported for this VM and as a result the backup is failing over to the NBDSSL (encrypted network block device) mode. (Backup job is running slow). The backup of a VMware VM is not using HotAdd Transport. For more details about HotAdd transport, see http://pubs.vmware.com/vsphere-60/index.jsp?topic=%2Fcom.vmware.vddk.pg.doc%2FvddkDataStruct.5.5.html

Verify the following HotAdd prerequisites:

VMFS Block Size

Maximum Target Disk Size

1 MB

256 GB

2 MB

512 GB

4 MB

1024 GB

8 MB

2048 GB

Solution

Disable “automount” on the backup proxy machine using “diskpart” utility.