VMware backups failing with status 23 for Hot add Transport type

Problem

VMware backups failing with status 23 for Hotadd Transport type

Error Message

Backup Jobs fails with status code 23:

Error bpbrm (pid=442605) from client client1 : ERR - Error opening the snapshot disks using given transport mode: hotadd Status 23

Findings from Vxms logs:

   09/18/2019 18:37:30 : openLeafSnapshotDisks:VixGuest.cpp:412 <DEBUG> : Calling connectToHost(SnapMoRef: snapshot-6534, TransportMode: hotadd)
   09/18/2019 18:37:31 : g_vixInterfaceLogger:libvix.cpp:1797 <DEBUG> : [VFM_ESINFO] 2019-09-18T18:37:31.159-04:00 error -[7F70E4F01780] [Originator@6876 sub=transport] Mounting VM vm-3395 using transport hotadd failed : Cannot use hotadd transport to mount Virtual Machines with disks that are not SCSI or SATA (adapter type: ide).

   09/18/2019 18:37:31 : g_vixInterfaceLogger:libvix.cpp:1797 <DEBUG> : [VFM_ESINFO] 2019-09-18T18:37:31.159-04:00 info -[7F70E4F01780] [Originator@6876 sub=transport] Deleted file /tmp/vmware-root/421982d5-a639-25ff-cab8-8d4d6353ba61-vm-3395/hotadd/unmount.dat

   09/18/2019 18:37:31 : g_vixInterfaceLogger:libvix.cpp:1797 <DEBUG> : [VFM_ESINFO] 2019-09-18T18:37:31.159-04:00 info -[7F70E4F01780] [Originator@6876 sub=transport] Deleted directory /tmp/vmware-root/421982d5-a639-25ff-cab8-8d4d6353ba61-vm-3395/hotadd

 09/18/2019 18:37:31 : g_vixInterfaceLogger:libvix.cpp:1797 <DEBUG> : [VFM_ESINFO] 2019-09-18T18:37:31.159-04:00 error -[7F70E4F01780] [Originator@6876 sub=transport] Cannot use mode hotadd to access [unity1_ITS_datastore_26] WUSMP111231-4EG/WUSMP111231-4EG.vmdk: Cannot mount using this method. (Mounting VM vm-3395 using transport hotadd failed : Cannot use hotadd transport to mount Virtual Machines with disks that are not SCSI or SATA (adapter type: ide).

   09/18/2019 18:37:31 : g_vixInterfaceLogger:libvix.cpp:1797 <DEBUG> : [VFM_ESINFO] VixDiskLib: Unable to locate appropriate transport mode to open disk. Error 13 (You do not have access rights to this file) (Mounting VM vm-3395 using transport hotadd failed : Cannot use hotadd transport to mount Virtual Machines with disks that are not SCSI or SATA (adapter type: ide).) at 4559.

   09/18/2019 18:37:31 : g_vixInterfaceLogger:libvix.cpp:1797 <DEBUG> : [VFM_ESINFO] VixDiskLib: VixDiskLib_OpenEx: Cannot open disk [unity1_ITS_datastore_26] WUSMP111231-4EG/WUSMP111231-4EG.vmdk. Error 13 (You do not have access rights to this file) (Mounting VM vm-3395 using transport hotadd failed : Cannot use hotadd transport to mount Virtual Machines with disks that are not SCSI or SATA (adapter type: ide).) at 4669.

Cause

Hotadd mode can not be used as a transport mode to backup VMs with IDE Virtual disks.

Solution

Either Change the affected disks to SCSI mode ( this will require a reboot of the virtual machine)  or use SAN or NBD transport mode to backup VMs with IDE disks.  

VMware Transport Modes: Best practices and troubleshooting