z/OS MVS Programming: Sysplex Services Guide
z/OS MVS Programming: Sysplex Services Guide
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Specifying Parity of a Changed Data Item z/OS MVS Programming: Sysplex Services Guide SA23-1400-00 |
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When you write a data item to the cache structure and specify CHANGED=YES,
you can specify bits (called parity bits) in the directory entry of
the data item. The system writes the parity bits only when the value
of the bits in the directory entry are null as follows:
Otherwise, the parity bits are left unchanged:
The system returns the parity bits as part of the directory entry when you issue IXLCACHE REQUEST=READ_DIRINFO with the DIRINFOFMT=DIRENTRYLIST keyword. The system does not use the parity bits. You establish your own protocol to use the parity bits. 
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