Sometimes, for special purpose we need to change the media density. Maybe our customer request restore for data that have been backed up, unfortunately our tape drive has upgrade to higher density. Maybe here is one of the way for changing media density to higher one. Here is the case where tape is written by LTO1 tape drive on L700 and will be restored to LTO3 on ACS-SL8500 tape library :
1. Identify the tape that is required for the restoration. This can be obtained from the catalog. To ensure this can be done with bpmedialist command :
2. Eject the tapes from the TLD library (L700).
3. Perform an inventory of the TLD library to change the RobotType to "standalone".
3. Perform an inventory of the TLD library to change the RobotType to "standalone".
4. Inject the tape into the ACS library.
Note: Some procedure is necessary to inject the tapes into the correct pool and setting the appropriate ownership.
5. After the tapes are injected into the ACS library, perform a robot inventory of the ACS library.
6. After the volume database is updated, the RobotType of the media will change to "ACS" and the tapes should be recognized as "hcart".
Note: Some procedure is necessary to inject the tapes into the correct pool and setting the appropriate ownership.
5. After the tapes are injected into the ACS library, perform a robot inventory of the ACS library.
6. After the volume database is updated, the RobotType of the media will change to "ACS" and the tapes should be recognized as "hcart".
7. Run "vmchange -new_mt -m " to change the density. It should be "hcart3" for the LTO Gen-3 drive and refers to the media barcode. An eg would be "vmchange -new_mt hcart3 -m TD2222".
8. Run "vmquery -m
9. One media server that holds this tape run "bpmedia -changeden -new-ev "
9. One media server that holds this tape run "bpmedia -changeden -new
Note: This command will take some time to complete. Please be patient and let it complete on it's own. If terminated halfway, strange things may occur later.
10. Run "bpmedialist -m
10. Run "bpmedialist -m
11. Run the normal restoration procedure to restore the data from the LTO Gen1 tapes using the ACS library.
12. Once, we have completed the restoration, the tape should be ejected from the ACS library to prevent it from being used for future backups. If necessary, will need to execute the commands in Step 7 and 9 to change the density back to "hcart".
12. Once, we have completed the restoration, the tape should be ejected from the ACS library to prevent it from being used for future backups. If necessary, will need to execute the commands in Step 7 and 9 to change the density back to "hcart".
