Backup jobs using Appliance transport mode (HotAdd) take longer after installing 9.5 Update 3a

Challenge

After installing Veeam Backup & Replication 9.5 Update 3a, backup duration could be significantly increased for jobs using Appliance transport mode (HotAdd). Nbd and Direct SAN/NFS transport modes are not affected.

Cause

This is a known issue affecting Virtual Disk Development Kit 6.5.2, Virtual Disk Development Kit 6.5.3 and Virtual Disk Development Kit 6.7 https://kb.vmware.com/s/article/55418

Solution

Hotfix for Veeam version 9.5.0.1922 is available to switch to unaffected VDDK versions. To install the hotfix:

1. Stop Veeam jobs and Veeam services
2. Make a backup copy of the following files and folders, from the backup server and all backup proxies:

   C:\Program Files (x86)\Veeam\Backup Transport\x64\vddk_6_5
   C:\Program Files (x86)\Veeam\Backup Transport\x64\vddk_6_7
   C:\Program Files (x86)\Veeam\Backup Transport\x64\VeeamAgent.exe

3. Replace the files listed in the previous step with those found in the hotfix package
4. Start Veeam services on server

Note: in case after applying the fix HotAdd stops working entirely, please install Visual C++ Redistributable Packages for Visual Studio 2013 package.

More Information

Download hotfix