Time-out errors may occur in Volume Shadow Copy Service (VSS) writers and result in snapshots that are not VSS compliant

In some circumstances, you may receive VSS errors showing that the volume shadow copy freeze timed out. As a result the snapshots that were created are not VSS compliant and the snapshot XML file used by the VSS-based wizards and vxsnap commands is not generated. Therefore, you cannot use any of the vxsnap commands or VSS-based wizards to restore or to reattach the snapshot. If the snapshot volumes have been scheduled for automatic updates with the Quick Recovery Configuration Wizard or VSS Snapshot Scheduler Wizard, the updates cannot occur. (633219)

Workaround: If a snapshot fails with this error, you can use volume-based commands to manually snapback individual snapshot volumes. You can use thevxassist snapback command or the Snap Back command from the Volumes node in the Veritas Enterprise Administrator console. Once the volumes are reattached and resynchronization is complete, you can create a new snapshot manually or scheduled snapshots can resume.

In addition, Microsoft supplies a hotfix that you can install to resolve this issue. Refer to the Microsoft Knowledge Base for details.