A post-command is not run if the job fails with '0xe000810c - Physical Volume Library Drive not available.' even though 'Run post-command even if job fails' option is specified.

When the target device is offline, a backup job fails with 0xe000810c error. In this case, only pre-command is executed even if a post-command is also specified with 'Run post-command even if job fails' option.

This problem occurs only when 'On this Backup Exec server' option is chosen on Pre/Post Commands page. If 'On each server backed up' is selected, neither pre-command nor post-command is run when the job fails with 0xe000810c error.

This issue is currently under investigation by Symantec Corporation. For more information please check the following article.
http://www.symantec.com/docs/TECH203412