IXCH0210E

Explanation
 CHECK(IBMXCF,XCF_CF_STR_DUPLEX) found one or more
allocated CF structures with DUPLEX specified as ALLOWED or ENABLED,
but the structure is not duplexed. When a structure is allocated with
a DUPLEX value of either ALLOWED or ENABLED, the structure should
be duplexed to support intended redundancy and recoverability. Duplexing
a structure provides redundancy that eliminates a single point of
failure. 
 Failure to start a duplexing rebuild usually means
that the environmental conditions required for a duplexing rebuild
have not all been met, and that you might or might need to take any
action. CHECK(IBMXCF,XCF_CF_STR_DUPLEX) issues this message to indicate
that one or more structures  that could potentially be duplexed have
not been. When a structure is not duplexed, it might be an oversight
that leaves the structure with less redundancy/recoverability than
was intended. 
 See message IXCH0920I in the message buffer,
for a list of the CF structures including the DUPLEX value specified
in the CFRM active policy and the current status of the structure.
 The status is one of the following:          Rebuilding - The structure rebuild process type is rebuild.         

Rebuild stopping - The structure rebuild process type is rebuild.   

   The process is being stopped.

Duplexing rebuild - The structure rebuild process type is           

   duplexing rebuild.           

Duplexing rebuild stopping - The structure rebuild process type     

   is duplexing rebuild. The process is being stopped to fall back  

   to the old instance.         

Duplexing rebuild switching - The structure rebuild process type    

   is duplexing rebuild. The process is being stopped to switch     

   to the new instance.         

Duplexed - The structure is allocated and duplexed.     

   (NOTE: Duplexed structures are only listed when the check is     

    run in verbose mode.)       

Simplex - The structure is allocated with only one instance.        

 For
structures with a DUPLEX value of ALLOWED, either the application
or an operator can initiate a duplexing rebuild. An operator can use
the command:  SETXCF START,REBUILD,DUPLEX,STRNAME=structure_name   
 However,
the system does not make any attempts to maintain the duplexed status
of the structure. The application or operator must initiate another
duplexing rebuild if duplexing is stopped. 
 For structures
with a DUPLEX value of ENABLED, the system initiates and attempts
to maintain the duplexed status of the structure. When a duplexing
rebuild process is stopped, the system attempts to initiate duplexing
again.   

System action
The system continues processing.

Operator response
Report this problem to the system programmer.

System programmer response
Generally, it is preferred to duplex
structures whenever the CFRM active policy indicates they can be.
If a particular structure is not duplexed, it might be an oversight
that leaves the structure with less redundancy/recoverability than
was intended. 
To obtain the current duplexing status for each
structure  listed in message IXCH0920I, use the display command: 
       DISPLAY XCF,STR,STRNAME=structure_name   

When
the structure is duplexed, no further action is needed. When the structure
is in the process of becoming duplexed,  reissue the display command
to confirm that duplexing has been established for the structure.
When structure duplexing stopd, determine the reason and take action
based on the DUPLEX specification for the structure. When the structure
is not duplexed, take action based on the DUPLEX specification for
the structure. 
  When the DUPLEX value is ALLOWED, initiate
a duplexing rebuild for the structure using the command:          SETXCF START,REBUILD,DUPLEX,STRNAME=structure_name   
If
a duplexing rebuild cannot be started, examine the resulting IXC367I
message and take action to allow the duplexing rebuild to start.  
 When
the DUPLEX value is ENABLED, either issue the SETXCF command (as shown
above)  to initiate a duplexing rebuild or examine the log messages
to understand why the duplexing rebuild cannot be initiated. Examine
messages indicating duplexing feasibility (message IXC574I) or giving
a reason for not initiating a duplexing rebuild (message IXC538I)
for the structure. 

Problem determination
N/A

Source
         Parallel Sysplex® (XCF)          

Module
         IXCHCSTR   

Routing code
See note 35.

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

Reference Documentation
 z/OS MVS Setting
Up a Sysplex