z/VM: CP Commands and Utilities Reference - z/VM - IBM

SET CACHEFW
SET CACHEFW
►►
Set
Authorization
Purpose
CACHEFW
Operands
Usage Notes
Responses
SUBSYStem
Privilege Class: B
Use the SET CACHEFW command to activate or deactivate the cache fast write
function in a DASD subsystem. This command is valid for cache storage
subsystems that support the cache fast write function.
SUBSYStem
specifyies that the entire storage subsystem is affected by this command,
regardless of which device within the subsystem receives the order. This is the
default (and only) value.
ON
indicates that the cache fast write function is to be activated for the subsystem.
OFF
indicates that the cache fast write function is to be deactivated for the
subsystem.
rdev
rdev1-rdev2
is the real device number, a list of real device numbers, or a range of real
device numbers of devices in the subsystems.
1. The SET CACHEFW function is only valid for storage subsystems that support
the cache fast write function.
2. If the subsystem cache is unavailable when the SET CACHEFW ON command
is issued, cache fast write data access begins when the cache is made
available (through SET CACHE SUBSYSTEM ON).
3. When SET CACHEFW OFF is issued, the cache fast write data for all devices
in the subsystem is destaged to the appropriate DASD.
4. There are certain error messages that may result if the subsystem is not in the
correct mode to accept the SET CACHEFW ON command. See error message
HCP296E for more information.
5. SET CACHEFW OFF may produce delayed responses. See “Delayed
Responses to CP Commands” on page 8 for more information.
Response 1:
ON
OFF
1200 z/VM: CP Commands and Utilities Reference
▼
rdev
rdev1-rdev2
►◄