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  1. A serial save is done instead of a parallel save when the save does not support writing to parallel devices, for example if *ALLUSR, *IBM or *NONSYS is specified for the Library (LIB) parameter on the Save Library (SAVLIBBRM) command.
  2. In releases IBM i 7.1 and IBM i 6.1, the following PTFs or their superseding PTFs are required:     
  3. In release V5R4M0, parallel saves of *IBM, *ALLUSR, generic libraries or a list of libraries may result in either parallel-parallel or serial-parallel format.  To force serial-parallel format for *IBM, *ALLUSR, generic libraries or a list of libraries, run the following command:

CRTDTAARA DTAARA(QUSRBRM/Q1APRLNONE) TYPE(*CHAR) LEN(1)

Performance considerations when saving and restoring data in parallel-parallel format

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