Use this command to:
- Destage any modified fast write data from cache to DASD to permit hardware
reconfiguration or system shutdown.
- Disable cache and DASD fast write functions for one or all of the 3990
record cache subsystem (RCS) control units.
Requirements and Restrictions
This command is valid only for 3990 RCS control units.
Format
- device
- is a 3990 record caching device address that is associated with a single
record cache subsystem ID.
- Note:
- The fast write data is destaged and the DASD and caching fast write functions
are disabled for all the devices in the specified RCS.
- ALL
- destages the fast write data and disables the DASD and caching fast write
functions for all the 3990 RCS control units in the complex.
Additional Information
- Online help information is available for this command. To display
the help information, enter one of the following:
ZBUFC HELP
ZBUFC ?
- Enter the ZBUFC ENABLE command to enable the DASD and caching fast write
functions again.
- Even though this command disables the DASD and cache fast write functions,
the cache is still active. Any fast write functions that are sent to
the control unit are written to cache and the DASD surface.
- Processing for this command differs for the 3990 Model 3 and the IBM
Enterprise Storage Server (ESS). See TPF Database
Reference for more information about these processing
differences.
Examples
In the following example, all the fast write data that is found in the 3990
RCS control unit and associated with the specified address is destaged, and
additional fast write functions that are sent to this control unit are
disabled.
+--------------------------------------------------------------------------------+
|User: ZBUFC FILE 04E7 |
| |
|System: BUFC0061I 13.50.08 BUFC UTILITY OPERATION(S) STARTED TO RCS SSID 0003 |
| BUFC0042I 13.50.09 ZBUFC FILE RCS SSID 0003 COMPLETE |
+--------------------------------------------------------------------------------+
Related Information
See the following for more information about record caching:
- TPF Database Reference
- 3990 Storage Control Planning, Installation, and
Storage Administration
- 3990 Storage Control Operations and Recovery
Guide
- 3990 Transaction Processing Facility Support
RPQs.