In some cases backups may fail with "Device or resource is busy". You may see an error as below in the appassure.log file located on the agent.
Error: bsctl encountered an error when processing command '--cancel-snapshot /dev/sda2 '.
Error: bsctl: ERROR: device /dev/sda2 is busy, please try again later
Error: System.InvalidOperationException: Failed to cancel snapshot for device path of '/dev/sda2' with error code 16
The fix for this issue is a two patch process. The agent and the core need patches.
*Note: If you are replicating you need to upgrade both your target and source cores with the Core patch.
https://s3.amazonaws.com/appassure_patches/P-1604/P-1604.msi (Includes Update 3)
https://s3.amazonaws.com/appassure_patches/P-1658/P-1658.msi (Includes Update 4)
CentOS / Rhel 6
Centos / Rhel 7
SLES 11 (SuSE Linux Enterprise Server)