OCE_XTIOT_CHECK

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 sample shows the defaults for customizable values for this check. Use this sample to make permanent check customizations in an HZSPRMxx parmlib member used at IBM Health Checker for z/OS startup. If you just want a one-time only update to the check defaults, omit the first line (ADDREPLACE POLICY) and use the UPDATE statement on a MODIFY hzsproc command. Note that using non-POLICY UPDATEs in HZSPRMxx can lead to unexpected results and is therefore not recommended. End of change

ADDREPLACE POLICY[(policyname)] [STATEMENT(name)]
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: 20110410CHECKSEVERITY: LOW                               
                                                                        
* LowSEVERITY 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