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Compression with ZLIB algorithm - Save Commands and APIs

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Abstract

IBM i 7.5 adds another option to Save commands and APIs for Save Files and Optical (including Virtual Optical) that have the data compression parameter. The new ZLIB option produces a smaller result and improves performance over existing options.

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The ZLIB algorithm provides another option for data compression. Test results show it is often faster than previously available algorithms and generally produces a smaller result, though actual results vary, depending on the compressibility of the data. The new algorithm automatically uses the on-chip Nest Accelerator (NX) GZIP when it runs in Power10 compatibility mode on a Power10 processor and is therefore faster and less CPU-intensive than previously available compression options.

For Save, the previously available options for compression were *LOW, *MEDIUM, and *HIGH.  The additional option for IBM i 7.5 is *ZLIB.

There is no change in the Restore processing.  The Restore process automatically determines the compression that was used.

Here is a list of the Save commands that support *ZLIB:

  • SAV
  • SAVCFG
  • SAVCHGOBJ
  • SAVDLO
  • SAVLIB
  • SAVLICPGM
  • SAVOBJ
  • SAVSECDTA
  • SAVSYS
  • SAVSYSINF
Here is a list of the APIs that support *ZLIB:
  • Save Object List (QSRSAVO)
  • Save Object (QsrSave)
  • Save to Application (QaneSava)
For more information about this topic, see the following sections in IBM Documentation:

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Document Information

Modified date:
03 May 2022

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ibm16579393