Hello,
Which device drivers are you using? Have you upgraded the drivers?
Please ensure that you are not using a RAID controller as they are not supported with Backup Exec.
Please try a power cycling the device and the server to redetect the tape and rebuild the database.
Check the system event log for event id's 7,9,11 and 15 if you have any please write here.
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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