Changing the state of coupling facility cache structures and volumes

You can use the VARY SMS command to control processing for volumes, data sets, or systems.

To alter the state of the specified CF cache structure, issue the VARY SMS command, using the following format:

VARY SMS,CFCACHE(CF_cache_structure_name),ENABLE|QUIESCE

When a CF cache structure is enabled, VSAM RLS data can be stored in the cache structure. This is the normal state of operations, and is the state the CF cache structure is in after the Parallel Sysplex® has been IPLed. When a CF cache structure is quiesced, no VSAM RLS data can be stored in it.

To alter the state of the specified volume as it relates to all CF cache structures, issue the VARY SMS command using the following format:

VARY SMS,CFVOL(volser),ENABLE|QUIESCE

When a volume is CF-enabled, data contained on this volume can be stored in a CF cache structure. in the cache structure. This is the normal state of operations. When a volume is CF-quiesced, no data contained on it can be stored in a CF cache structure.

Use the VARY SMS CFVOL command if it is necessary to modify a volume without using the VSAM PUT/ERASE macros or DFSMSdss. This ensures that when the modified volume is again made available for VSAM RLS processing, CF cache structures do not contain downlevel data.

Rule: Setting a volume to the CF-quiesced state does not stop SMS from selecting this volume during data set allocation. To stop SMS from selecting this volume, issue the VARY SMS command, using the following format: VARY SMS,VOLUME(volser),DISABLE