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1. Import phase 1 and phase 2 from every single tape
This will properly do the job - good.
Will take so much of time if you have hundreds of tapes - bad.
2. Copy the image database directory over.
This is not a supported way, and it may result in some unexpected behavior in NetBackup image clean up.
By copying the old server's /usr/openv/netbackup/db/images/clinetnames* directories over to the current NetBackup master, you'll have the catalog updated.
When you need to restore something, you do the "preview" (if you are using Java GUI) and it will tell you the required tapes, then you just load them in your tape library, update the inventory, immediately move them to a safe volume pool so that the new backup jobs do not overwrite on those tapes, then kick off the restore.
That's what I can think of.
Because the versions are different, and the hostnames are different, I don't think you can really merge the EMM database.
The document is from the days of version 4x 5x, will it be ok to try the procedure with NBU 6.x?
I heard (from this forum page) that if there are no image database entries, image cleanup process expires all the media in EMM.
Won't NBU clean up the image database, if all those tapes are not in assigned status?