IXCH0248E

Explanation
CHECK(IBMXCF,XCF_SIG_STR_SIZE) found
that the structure does not contain enough list entries to support
full signaling connectivity among all active systems in the sysplex.
When a list within the structure is used for a signaling
path, the checkowner_or_installation specification
requires that there be at least MinimumNumber list
entries available for each signaling path in the sysplex.  List entries
are used to buffer signals for the path.  There are only  CurrentNumber list
entries per path available to XCF in the current signaling structure. 
The
number of signaling paths in the sysplex is a function of the number
of active systems. Each of the NumberSystems active
systems can have two paths (PATHIN and PATHOUT) to every other active
system for a total of  NumberPaths signaling paths.
In order for this structure to meet the checkowner_or_installation specification,
at least NeededEntries list entries are required.
This total includes some list entry "overhead" needed by XCF for non-pathing
functions. 
Use the Coupling Facility Structure
Sizer Tool (CFSizer) to determine the SIZE parameter for XCF signaling
structures. The CFSIZER tool is available at http://www.ibm.com/systems/support/z/cfsizer.
In the message text:StrName
The signaling structure in use by XCF.

In the message explanation:MinimumNumber
The checkowner_or_installation specification
of the minimum number of list entries per signaling path available
to each signaling structure.
CurrentNumber
The number of list entries per signaling path available to XCF
in this structure.
NumberSystems
The number of systems active in the sysplex.
NumberPaths
The number of signaling paths to connect all systems. 
NeededEntries
The minimum number of list entries in the signaling structure
needed to meet the checkowner_or_installation specification.

System action
This check is performed against
all signaling structures in use by this system and allocated in a
coupling facility. The system continues processing.

Operator response
Report this problem to the system programmer.

System programmer response
Run the Coupling Facility
Structure Sizer Tool (CFSizer) to determine the SIZE parameter for
this XCF signaling structure. Note that CFSizer calculates 20 list
entries required for each list, which is why 20 is the default parameter
value for this check. If the checkowner_or_installation specification
is greater than 20, the CFSizer results will need to scale up accordingly. 
Modify the structure in the CFRM policy with the new
size value. Activate that CFRM policy.
If XCF
does not automatically rebuild the structure as a result of the policy
activation, initiate a rebuild of the structure by issuing the command:  SETXCF START,REBUILD,STRNAME=IXCxxx           
 where
IXCxxx is the name of the signaling structure.
On
successful completion of the rebuild, XCF issues message IXC457I on
the system that (re)allocates the structure to indicate the number
of lists in the structure, the number of systems that can establish
full signaling connectivity through those lists, and the maximum number
of signals (list entries) that can be  supported by each list at one
time. 
 Verify that the structure is in use by
XCF for signaling:  D XCF,PI,STRNAME=IXCxxx           

  D XCF,PO,STRNAME=IXCxxx           

Problem determination
N/A

Source
         Parallel Sysplex® (XCF)          

Module
         IXCHCSIG   

Routing code
See note 35.

Descriptor code
3 is the default set by this check. See note
1.

Reference Documentation
For
additional information about configuring signaling services using
XCF list structures, see "Planning Signaling Services in a Sysplex"
and "Tuning the Signaling Service" in z/OS MVS Setting Up a Sysplex.
z/OS
MVS System Commands