gtpo1m27Operations

ZBUFC SETCACHE-Set Cache Operating Modes

Use this command to change the cache resource states for the 3990 record cache subsystem (RCS) to perform cache error recovery options.

Requirements and Restrictions

Format




sda
is the 3- to 4-digit hexadecimal symbolic address of a device.

SSCACHE
sets the SSCACHE function, where:

ON
Allows the 3990 subsystem storage (volatile cache) to be logically brought online for normal caching operations.

OFF
Allows the 3990 subsystem storage (volatile cache) to be logically taken offline, preventing normal caching operations.

FORCE
Allows the 3990 subsystem storage (volatile cache) to be logically taken offline from a pending offline state.

REINIT
Resets the 3990 cache and nonvolatile storage operating states to a default state and reinitializes all status tracks. Use this option with caution because all modified cache data is invalidated, possibly resulting in data loss from the volatile and nonvolatile storage.

CFW
sets the CFW function, where:

ON
Allows the 3990 subsystem storage cache fast write function to be logically brought online for the subsystem.

OFF
Allows the 3990 subsystem storage cache fast write function to be logically taken offline for the subsystem.

NVS
sets the NVS function, where:

ON
Allows the 3990 subsystem nonvolatile storage to be logically brought online for the subsystem.

OFF
Allows the 3990 subsystem nonvolatile storage to be logically taken offline for the subsystem.

DEVCACHE
sets the DEVCACHE function, where:

ON
Allows caching to be started for the specified RCS device address.

OFF
Allows caching to be stopped for the specified RCS device address.

DEVDFW
sets the DEVDFW function, where:

ON
Allows DASD fast write to be started for the specified RCS device address.

OFF
Allows DASD fast write to be stopped for the specified RCS device address.

FORCE
Allows DASD fast write to be stopped by force from a pending offline state for the specified RCS device address.

DEVRECM
sets the DEVRECM function, where:

ON
Allows record mode to be started for the specified RCS device address.

OFF
Allows record mode to be stopped for the specified RCS device address.
Note:
Some options for the ZBUFC SETCACHE function may be rejected by the 3990 RCS control unit if they are not compatible with the existing cache status.

Additional Information

Examples

The SSCACHE function is turned on in the following example.

+---------------------------------------------------------------------------------------------+
|User:   ZBUFC SETC 04E7 SSCACHE ON                                                           |
|                                                                                             |
|System: BUFC0059I 13.51.53 CACHE RECOVERY REQUEST INITIATED ON DEVICE 04E7 RCS SSID 0003     |
+---------------------------------------------------------------------------------------------+

The CFW function is turned off in the following example.

+---------------------------------------------------------------------------------------------+
|User:   ZBUFC SETCACHE 04E7 CFW OFF                                                          |
|                                                                                             |
|System: BUFC0059I 13.52.24 CACHE RECOVERY REQUEST INITIATED ON DEVICE 1E53 RCS SSID 0003     |
+---------------------------------------------------------------------------------------------+

Related Information

See the following for more information about record caching: