Defining a Cached DASD as a Dedicated Device
You can give your virtual machine exclusive use of a cached DASD
with the DEDICATE directory statement. In your virtual machine's directory,
code a DEDICATE directory statement and optionally a DASDOPT directory
statement. To dedicate a cached DASD at real device number 199 to
virtual device number 199, include these statements in your directory:
DEDICATE 199 199
DASDOPT SYSCTLIf you do not include the DASDOPT directory statement, the default is DEVCTL.