Hello,
To resolve this issue, run a disk defragmentation on the hard disks when the backup is not running, disable virus scans, and stop any third party applications that cause excessive disk writes during the backup. If all third-party applications have been stopped, and the error still occurs, the Minimum Quiet Time for AOFO can be lowered on the problem machine.
Also follow the steps in this technote for snapping one volume at a time.
How to get Advanced Open File Option to snap one volume at a time during multi-volume backups
http://support.veritas.com/docs/264464
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