Hello,
First the configuration
Netbackup 6.5 Entreprise server with one master and a media server and a IBM 3584 with 4 LTO3 drive. 2 Drives and the control of the robot are attached to the master and 2 drives to the media.
I have a vaulting job who duplicate backup from disk to tape and make a catalog backup tape. These tapes are ejected.
As the begining, for daily backup, the vaulting job ejected 2 tape, one for the data (650 Mo) a one for the catalog.
But since end of last week, vault job always for daily backup eject 4 tapes, 2 for the data (about 750 Mo) and 2 for the catalog
here the vault report
MEDIA SLOTID EXPIRATION IMAGES MBYTES CATEGORY EJECTED
B00306 1 10/31/2007 177 345565 NBU YES
B00353 29 11/01/2007 1 7598 New CTLG YES
B00385 30 11/01/2007 1 54 New CTLG YES
B00389 28 10/31/2007 246 418394 NBU YES
I can understand that duplication use 2 tapes for the backup, but can't understand why it use 2 tape for the catalog.
The storage unit is configured with 2 tapes with 1 maximum concurrent drive configured.
It look like the vault job start with one tape on drive1 for the D:\Program Files\Veritas\NetBackupDB\staging\EMM_DATA.db and when the job CATALOG_DRIVEN_BACKUP start it use the 2 drive with another tape.
No change were done since the installation so I can't understand why It use 2 tapes as It use only one tape a the beginning.
Any help appreciated
Regards