Chunk

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A portion of a dump either on tape or in the holding disk. Use chunks to make more efficient use of the tape or holding disk. For example, if you have a tape size of 10 GB, the only way to get a dump of 12 GB onto tape is to split it up into chunks and use spanning. Control with chunksize (per Holding disk) or tape_splitsize, split_diskbuffer and fallback_splitsize (per dumptype) in amanda.conf(5).

See also How To:Split Dumps Across Tapes.