IBM i 7.5 and IBM i 7.4 add 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.
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 and IBM i 7.4 TR 7 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:
- Save Object List (QSRSAVO)
- Save Object (QsrSave)
- Save to Application (QaneSava)
- CPF37A9 - Specified data compression not supported for target release.
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10 March 2023