OCE_XTIOT

Description:

This check looks to see whether XTIOTs are enabled for non-VSAM data sets. You can enable XTIOTs for non-VSAM data by specifying NON_VSAM_XTIOT=YES sets in the DEVSUPxx parmlib member. NON_VSAM_XTIOT=YES has to be specified in every DEVSUPxx member that is identified by the current DEVSUPxx suffix list (as specified by DEVSUP=(xx,...,zz) in IEASYSxx). Otherwise the NON_VSAM_XTIOT value might get reset to its default of NO by one of the DEVSUPxx members which do not list NON_VSAM_XTIOT=YES explicitly.

Reason for check:

Enabling XTIOTs for non-VSAM data sets decreases the chances of running out of virtual storage when allocating and concurrently opening many sequential and partitioned data sets.

z/OS® releases the check applies to:

z/OS V2R1 and later.

Type of check (local or remote):

Local

User override of IBM® values:

The following shows the default keywords for the check, which you can override on either a POLICY statement in the HZSPRMxx parmlib member or on a MODIFY command. This statement may be copied and modified to override the check defaults:

UPDATE CHECK(IBMOCE, OCE_XTIOT_CHECK) 
INTERVAL(ONETIME),
SEVERITY(LOW) 
DATE('date_of_the_change')
Reason('Your reason for making the update.')

Debug support:

Verbose support:

Parameters accepted:

Reference:

For additional information, see the DEVSUPxx parmlib member in z/OS MVS Initialization and Tuning Reference.

Messages:

This check issues the following exception messages:

IEC0H0101E

See the in z/OS MVS System Messages, Vol 7 (IEB-IEE).

SECLABEL recommended for multilevel security users:

SYSLOW - see z/OS Planning for Multilevel Security and the Common Criteria for information on using SECLABELs.

Output:

The following shows sample output from the check exception:

CHECK(IBMOCE,OCE_XTIOT_CHECK)                                           
START TIME: 08/29/2011 12:52:06.852243                                  
CHECK DATE: 20110410  CHECK SEVERITY: LOW                               
                                                                        
* Low Severity Exception *                                              
                                                                        
IEC0H0101E XTIOTs for non vsam data sets is not active                  
IBM suggests setting NON_VSAM_XTIOT=YES                                 
in the DEVSUPxx member of SYS1.PARMLIB.                                 
                                                                        
  Explanation:  IBM suggests setting NON_VSAM_XTIOT=YES in the DEVSUPxx 
    member of SYS1.PARMLIB to decrease the chances of running out of    
    virtural storage when allocating and concurrently opening many      
    sequential and partitioned data sets.                               
                                                                        
  System Action:  The system continues processing.                      
                                                                        
  Operator Response:  N/A                                               
                                                                        
  System Programmer Response:  Encourage the use of XTIOT allocations.  
                                                                        
  Problem Determination:  N/A                                           
                                                                        
  Source:  DFSMS OPEN/CLOSE/EOV                                         
                                                                        
  Reference Documentation:  For additional information see:             
                                                                        
    z/OS V1R12.0 MVS Initialization and Tuning Reference                
                                                                        
                                                                        
  Automation:  N/A                                                      
                                                                        
  Check Reason:  Check whether XTIOTs for non VSAM is enabled.          
                                                                        
END TIME: 08/29/2011 12:52:06.869138  STATUS: EXCEPTION-LOW