For cache structures allocated in a coupling facility of CFLEVEL=12 or higher, use the WRITE_DATALIST request to specify a set of data entries to be written to the cache structure. Each data entry to be written is described by a write-operation-block, mapped by IXLYWOB. The write-operation-blocks are placed in the storage area specified by BUFFER or BUFLIST. The result of the write operation is placed in a write-operation-response-block, mapped by IXLYWORB.

The system references the write-operation-blocks by an index into BUFFER or BUFLIST and processes them sequentially.