CACHE parameter

Cache fast write

Summary

Default value

X'00'

Parameter type

System

Where set

On User 0's parameter line at initialization; it cannot be reset during the run

Related products

All

Introduced

Model 204 V6.1 or earlier

Description

Allows data to be written directly to a controller's cache

You can use the cache fast write feature for the CCATEMP and CCASERV data sets. It is available for cached DASD controllers like the IBM models 3 and 6.

A write is considered successful as soon as it is accepted by the cache. If the cache capacity is exceeded, parts of the data are downloaded to disk. Upon cache or DASD failure, the disk image is not guaranteed.

The valid settings of CACHE are:

Setting	Meaning
X'00'	Do not use cache fast write (default)
X'01'	Use cache fast write for CCASERV access
X'02'	Use cache fast write for CCATEMP access
X'03'	Use cache fast write for CCATEMP and CCASERV access