In addition to the structure slot availability requirement, you must have enough storage space in your Coupling Facility to support the maximum size you specify for the IOA structures. Total the planned size for the list, cache, and lock structures. If your coupling facility does not have enough storage space available, try specifying structures with a smaller maximum size.

To check available Coupling Facility storage space, enter the following command from the MVS console:

DISPLAY CF

An example of the display output is shown below. The FREE SPACE statistic shows the current storage available in each partition of the Coupling Facility.

Figure 19 Checking Coupling Facility storage space

D CF 

IXL150I  10.35.43  DISPLAY CF 906 

COUPLING FACILITY 009674.IBM.02.000000040087 

                  PARTITION: 2  CPCID: 00 

                  Control UNIT ID: FFF9 

NAMED CFPART02 

COUPLING FACILITY SPACE UTILIZATION 

 ALLOCATED SPACE                 DUMP SPACE UTILIZATION 

  STRUCTURES:     602368 K        STRUCTURE DUMP TABLES:        0 K 

  DUMP SPACE:       2048 K                  TABLE COUNT:        0 

 FREE SPACE:      411648 K       FREE DUMP SPACE:            2048 K 

TOTAL SPACE:     1016064 K      TOTAL DUMP SPACE:            2048 K 

                               MAX REQUESTED DUMP SPACE:        0 K 

   VOLATILE:         YES         STORAGE INCREMENT SIZE:      256 K 

    CFLEVEL:           3 

COUPLING FACILITY SPACE CONFIGURATION 

                          IN USE          FREE         TOTAL 

Control SPACE:          604416 K      411648 K     1016064 K 

NON-Control SPACE:           0 K           0 K           0 K 

SENDER PATH        PHYSICAL     LOGICAL     STATUS 

        68         ONLINE       ONLINE      VALID 

        69         OFFLINE      ONLINE      NOT OPERATIONAL 

COUPLING FACILITY DEVICE     SUBCHANNEL     STATUS 

                   FFF0         0DE0        OPERATIONAL/NOT IN USE 

                   FFF1         0DE1        OPERATIONAL/NOT IN USE 

                   FFF2         0DE2        OPERATIONAL/IN USE 

                   FFF3         0DE3        OPERATIONAL/IN USE 

COUPLING FACILITY 009674.IBM.02.000000040087 

                  PARTITION: 1  CPCID: 00 

                  Control UNIT ID: FFFE 

D CF 

IXL150I  10.35.43  DISPLAY CF 906 

Note: For XAE Variable Databases, it is important to specify enough storage space to keep the structures from filling up, but not so much storage that Coupling Facility resources are wasted. If either structure reaches its storage limit, XAE processing may be unsuccessful.