Datacom support of dynamic growth and rebuild of MUFPLEX list and lock Coupling Facility structures

Products

• Datacom
• DATACOM - AD
• COMMON SERVICES FOR Z/OS

Issue/Introduction

Can both the INITSIZE and SIZE parameters of the CF structure definitions be specified to allow the structure to grow from the INITSIZE value up to the SIZE value?
Can a structure REBUILD be performed using SETXCF START, REBUILD?

Resolution

CF structure growth from INITSIZE to SIZE (both specified as 1k entities in the CFRM policy) is transparent to applications and supported by Datacom.

A structure REBUILD, assigning a new size to the CF structure, is not supported. MUF would have to be recycled to work with the re-built structure.
However, a shadow MUF does not connect to the CF until it enters full MUFPLEX mode; i.e. usually during MIGRATE_TO_SHADOW processing. A REBUILD is therefore possible as long as the shadow is only in stand-by mode.