DSNB801I   MAX STRUCTURE SIZE INDICATED IN MVS CFRM POLICY = size KB ESTIMATED NUMBER OF DIRECTORY ENTRIES = dir# ESTIMATED NUMBER OF DATA PAGES = data#

This message is issued in response to an ALTER GROUPBUFFERPOOL command after the directory entry to data page ratio is successfully updated. It is also issued for the first ALTER GROUPBUFFERPOOL command for a group buffer pool, even when no ratio value is specified on the command (in this case, the default ratio value is used). The group buffer pool is identified in message DSNB800I, which immediately precedes this message.

Because the actual ratio change does not take affect until the group buffer pool is reallocated, this message shows the estimated number of directory entries and data pages that are allocated based on the new ratio and the maximum size of the coupling facility structure, as indicated in the active CFRM policy definition. The actual number of entries that are allocated varies based on the amount of coupling facility storage that is available at the time the allocation is attempted, and on the amount of storage overhead necessary for the coupling facility control structures. Because DB2® cannot determine these variables, the estimated number of directory and data entries displayed in this message assumes that the entire storage allocation for the coupling facility cache structure will be used for directory and data entries, which is not the case.