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 —  Operations  —

DATACACHE : Data Storage Controller Caching

This parameter applies to the operating systems OS/390, z/OS, VM/ESA, and z/VM only.

Parameter Specify . . . Possible Values Default
DATACACHE whether to enable (YES) or disable (NO) controller caching for Data Storage (DATA) dataset. YES | NO YES
Value Meaning
YES The default setting. Data Storage blocks are preread and maintained as long as possible in the caching facilities of the disk controller.
NO Data Storage blocks are not preread.

Notes:

  1. If Data Storage blocks are highly scattered or the update frequency is low, controller caching can cause longer I/O response times.
  2. ADARUN caching control parameters also exist for the Associator (ASSOCACHE), the work area (WORKCACHE), the sort area (SORTCACHE), and the temp area (TEMPCACHE).

Example:

Run the nucleus without controller caching for the Data Storage dataset. 

ADARUN PROG=ADANUC,DATACACHE=NO

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