About SPC-2 SCSI reserve on HP-UX
By default, NetBackup uses SPC-2 SCSI reserve and release for tape drive reservations in shared drive environments. However, you must disable SPC-2 SCSI reserve and release in HP-UX. If you do not, conflicts occur between the operating system and NetBackup. The NetBackup Shared Storage Option provides shared drive functionality in NetBackup.
Veritas recommends that you use the SAM utility to disable SPC-2 SCSI reserve and release.
As an alternative to SCSI reserve and release, you can use SCSI persistent reserve in NetBackup for shared tape drive reservations. If you use SCSI persistent reserve, you still must disable SPC-2 SCSI reserve and release in HP-UX.
For more information about NetBackup and SCSI reservations, see the following:
The description of the Media host property in the NetBackup Administrator's Guide, Volume I.
The "How NetBackup reserves drives" topic in the NetBackup Administrator's Guide, Volume II.