Hello,
1. The drive going offline is not related to the catalogs.
please verify if the drive is compatible with Veritas Backup Exec v9.1. If it is compatible and explicitely tested with v9.1, then you can try installing the latest drivers, otherwise you can use the drivers provided by the drive manufacturer.
The compatibility list link the mentioned below:
1. Backup Exec 9.x for Windows Servers Robotic Library Hardware Compatibility List (HCL) (includes tested drives)
http://support.veritas.com/docs/271383
Please refer to the link mentioned below to download the latest Veritas drivers:
VERITAS Backup Exec (tm) 9.1 - Device Driver Installer (20050115) - Includes Tape Driver Release (20041231) and Robotic Library Release (45) (Intel Only)
http://support.veritas.com/docs/273853
Also check for id 7,9,11,15 in the system event log and write back
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