Tape management & initialization - BRBACKUP

Hi,
We have ECC 6.0 with Oracle on AIX 5.3.
I am taking backups onto tape using BRTools. The device file BRBackup recognizing is /dev/rmt0.1
First, I initialize the tape with the command:
brbackup -i force -v <tape volume name>
Then I will use BRTools to trigger backup.
My query is :
I have a set of 20 tapes loaded on to the cartridge. When all the 20 tapes are finished, I will have to take backup on to the 1st tape again. However, there will be a backup taken earlier on this tape.
How do I handle the tape that is already written once?
Do I need to initialize it again with a new volume name?
Is the new backup appended to the already taken backup or is it written from the beginning of the tape?
How do I restore the the current backup in case of a necessity?
Thanks for your help,
Abdul

Hi
tape_address=/dev/rmt0.1 and tape_address=/dev/rmt0 are pointing to the Tape Device Drivers to achieve two different functionalities/characteristics of that connected Tape Device/Drive in AIX system. Both are Operating System specifics.
Both are used for positioning and rewind operations while performing backup/restore operations using BR Programs.
Please refer [this useful link|http://blog.worldiswelcome.com/science-and-technology/aix/backups/2009/03/all-you-wanted-to-know-about-aix-tape-device-backups-ii/] to get more information.
with /dev/rmt0 (rewind driver)
The backup/restore operation will start at the point where the device pointer is at present.But, the tape is rewinded to Zero position once the backup/restore operation is finished.
with /dev/rmt0.1 (no-rewind driver)
The backup/restore operation will start from the previous point where the pointer was, at the end of previous backup/restore operation. Similarly, the tape is not rewinded to start after the backup/restore operation is finished.This is the most common option used in tape backups.
As per this [SAP Note 4160 - Tape management for recovery|https://service.sap.com/sap/support/notes/4160],
When using the "rewind driver" , the tape is automatically rewound to the beginning after completion of the command.
Positioning (e.g. mt -f/dev/rmt/0mnfsf <#>) sets the tape to the<#+1> file. E.g.:
mt-f /dev/rmt/0mnfsf 4 positions to the 5th file.
The "rewind driver" must used for rewind, the "norewind driver" for positioning.
Use the"norewind driver" for restore and file displaying, so that the tape head is then always automatically set to the next cpio block.
The value of expire_period is the retention period for the Tapes writen by BRBACKUP/BRARCHIVE. If you have set expire_period=5 then, on 6th day the Tape will be overwritten. It means that writing to a volume is possible 5 days after the volume was mounted and used.
Please do not change the existing settings of tape_address and tape_Address_rew parameters.
By keeping in mind the following factors,You can design your Backup Cycle Strategy.
The Role of System in Business, the Size of Database, The size of Tape, Growth Rate of Database, Number of Backups per Backup Cycle, Frequency of Backup operations, The data protection period, etc.
Regards,
Bhavik G. Shroff

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    I am taking backups onto tape using BRTools. The device file BRBackup recognizing is /dev/rmt0.1
    First, I initialize the tape with the command:
    brbackup -i force -v <tape volume name>
    Then I will use BRTools to trigger backup.
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