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When migrating to media type CART, the migration mission places as many files as possible on the same volume. Any space remaining is used by a subsequent run of the same migration mission. When insufficient space remains, a scratch volume is used.
Before writing each file, the migration process determines if the file fits on the volume (based on the CART media capacity parameter CARTLEN specified in the IOASPRM member). If the file does not fit, a new scratch volume is used. If the file is larger than the specified volume capacity, the migration process uses a new volume for that file and then uses as many volumes (not exceeding five) as needed.
Miscalculating the remaining space (because the specific volume was smaller or the compression factor was lower than expected) can cause the file to span more than one volume. This can result in slower retrieval response time.
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