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Compression with ZLIB algorithm - Geographic Mirroring synchronization



IBM i 7.5 and IBM i 7.4 TR 6 use ZLIB compression for Geographic Mirroring synchronization, which produces a smaller result and improves performance over existing options.


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The ZLIB algorithm provides a new 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.
This new ZLIB algorithm can be used with IBM i 7.5 and IBM i 7.4 TR 6 to compress geographic mirror data when that data is sent between systems.  By reducing the amount of data to send, configurations with compressible data can achieve faster geographic mirroring synchronization.
Code requirements:
  • For IBM i 7.5, load and apply PTF SI78549.
  • For IBM i 7.4, load and apply PTF SI78539.
For more information, see these topics in IBM Documentation:

[{"Type":"MASTER","Line of Business":{"code":"LOB57","label":"Power"},"Business Unit":{"code":"BU058","label":"IBM Infrastructure w\/TPS"},"Product":{"code":"SWG60","label":"IBM i"},"ARM Category":[{"code":"a8m0z0000000CMQAA2","label":"High Availability-\u003EGeographic Mirror"}],"ARM Case Number":"","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"7.4.0;7.5.0"}]

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Modified date:
16 May 2022