Since LTO7 can't read LTO4 (lto can only read N-2), you will need to add new LTO7 drives to both libraries while keeping LTO4 drives. Add as many LTO7 drives as you can while keeping the same number of LTO4 drives. For example your first server has 2 LTO4 drives, put at least 2 LTO7 drives if you can.
You will need 2 device classes, one for LTO4 and one for LTO7 (more info:
https://www.ibm.com/support/knowled...v.doc/t_devclass_lto_generations_mix_ulw.html)
And you will need to create a new storage pool for LTO7.
For backups going directly to tape, update the copygroups to point to the new LTO7 devclass
For the disk pool, update the nextpool to point to the LTO7 pool.
And to move the data from LTO4 to LTO7, you have two options:
1 - Migrate the data.
- update the nextpool of the LTO4 pool to point to the LTO7 pool
- update the migprocess of the stgpool to match the number of pairs of LTO4/7 you have available. So if you have 2 LTO4 and 2 LTO7, you could use a migprocess=2 assuming there is no other activity using the drives
- use the MIGRATE STGPOOL command to move the data from LTO4 to LTO7 with a duration. For example, if you have 3 hours in the afternoon where the tape drives are free, do the migration in the afternoon with a duration of 3 hours and repeat every day until you are done.
2 - use move data
- anytime the server is idle, use the MOVE DATA command to move the data from individual LTO4 tapes one by one. You can issue as many MOVE DATA as you have free pairs of LTO4/7.
- repeat until all done.
For the offsite pools, the best way will be to use DELETE VOLUME DISCARDDATA=YES to delete individual offsite volumes and then perform a backup stgpool to create new offsite volumes on LTO7. Don't do all the volumes at once, the backup stgpool would run forever. Do a few a day, if you see you have spare cycles, you can do more.
