Alex: Create MSIR.1096 page: description and response

2026-10-06T13:06:48Z

Create MSIR.1096 page: description and response

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During initialization of the compression subsystem, <var class="product">[[Model 204]]</var> determined that the hardware DEFLATE Conversion Facility (the <var>DFLTCC</var> instruction) is available on this processor, and has enabled it. Deflate compression and inflate decompression will be performed by the hardware instruction instead of by the equivalent software routines, which substantially reduces the CPU cost of compression.


The facility is detected at initialization by testing facility bit 151 of the stored facility list; it is available on IBM z15 and later processors. When it is present, <var class="product">Model 204</var> allocates the parameter block and history buffer that the instruction requires for each compression buffer.


Response: None required. The message is informational and is issued once, at initialization, to the operator and the audit trail. Compare with <var>[[MSIR.1097]]</var>, which is issued when the facility is not available.

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MSIR.1096 - Revision history

Alex: Create MSIR.1096 page: description and response