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NetApp supports NDMP Dump backup at 256 KB block size (MOVER_RECORD_SIZE). How to change this value from IBM TSM. Different softwares provide options to change this value. Does TSM provide support to change the same.
I don't believe the DISKBUFFSIZE applies to NDMP backups because the data is written to media by the filer, not by TSM. I would not experiment with the DISKBUFFSIZE unless you are trying to solve a performance problem that can be solved by tuning that.
I could not find any options in TSM to change the block size.