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

KB ID: 3220
Product: Veeam Backup & Replication | 10
Published: 2020-07-10
Last Modified: 2021-12-07
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Article Applicability
This article discusses a limitation specific to Veeam Backup & Replication 10.x. When Linux-based VMware Backup Proxy was introduced in Veeam Backup & Replication 10, it could only use the Virtual Appliance (HOTADD) transport mode. Starting with Veeam Backup & Replication 11, a Linux-based VMware Backup Proxy can use additional transport modes, including network mode.

Challenge

Backup Job for VMs from ESXi hosts with "Content Based Read Cache" (CBRC) enabled fail and and the following error is shown:

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 a Linux-based VMware Backup Proxy is used by a backup job because 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 a VMware limitation,  when CBRC is enabled, it is impossible to attach disks to VMs while powered-on.

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

Solution

To resolve this issue, upgrade to Veeam Backup & Replication 11 or newer. The most recent version of Veeam Backup & Replication can be found here. Starting with Veeam Backup & Replication 11, new transport mode options are available to Linux-based VMware Backup Proxies, meaning that the proxy will be able to failover to use nework transport mode and the job will not fail.

Workaround

If it is not possible to upgrade Veeam Backup & Replication to version 11 or newer, the following workarounds may be used with Veeam Backup & Replication 10:

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