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Hi,
if the tape was labeled before, you do not need to relabel it again. When TSM is going to use any tape, it has to have an internal label - if it does not, it is not used. This internal label has to match with "expected" label - based on library inventory (so when you swap tapes in slots TSM does not overwrite another tape).
When checking the tape in the library, you can use "checklabel=barcode" - which believes the barcode is used as the internal label and does not load the tape to drive to check the internal label. When using "checklabel=yes" during audit, tape is loaded in the drive and the internal label is checked (it is useful when the barcode is unreadable or peeled off).
Also - your library can be set with AUTOLABEL and/or RELABELSCRATCH
https://www.ibm.com/support/knowled.../srv.reference/r_cmd_library_scsi_define.html
Again - labeling once is enough.
Hope it helps
Harry