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Backups of VMs with enabled CBRC option fails when Linux backup proxies are used

KB ID: 3220
Product: Veeam Backup & Replication
Version: 10 and later
Published: 2020-07-10
Last Modified: 2020-08-13

Challenge

Backups of VMs from ESXi hosts with the enabled Content Based Read Cache (CBRC) fail and you get the following errors in HTML report generated for a failed job:
Error    Hot-add of digest enabled disk not supported scsi0:1.
Error    Failed to attach disk 2000 to source Linux backup proxy <IP address> (<GUID>) (System.Exception)

 

Cause

This issue occurs if Linux proxy is selected in a backup job, when Veeam tries to hot-add a virtual disk to a VM which is deployed on the ESXi host with the CBRC option enabled.
Due to the VMware limitation, you cannot attach disks to VMs while they are powered-on.
Veeam Linux proxies have only one transport mode (hot-add) so far. That is not the case with regular Windows proxies. 

According to VMware documentation CBRC feature was introduced in vSphere 5.1, thus may affect all systems with this version and above.

Solution

To back up a VM with the enbaled CBRC option, you can try the following options:

More information

https://kb.vmware.com/s/article/2072804
KB ID: 3220
Product: Veeam Backup & Replication
Version: 10 and later
Published: 2020-07-10
Last Modified: 2020-08-13

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