XCF_SFM_CFSTRHANGTIME
- Description:
- This check monitors the current setting of the CFSTRHANGTIME value in the sysplex failure management (SFM) policy to make sure it has not changed from the setting most desirable for your installation. It does this by comparing the SFM CFSTRHANGTIME value with the check parameter CFSTRHANGTIME value that you specify, issuing an exception message if the two are not consistent. The CFSTRHANGTIME SFM parameter specifies the amount of time you are willing to wait before the system takes automatic action to relieve hangs caused when a connector fails to respond to structure-related events in a timely manner.
- Reason for check:
- Installation should specify SFM policy parameter CFSTRHANGTIME
so that the system automatically takes action to relieve hangs in
CF structure-related processes caused by a connector's failure to
respond to structure-related events in a timely manner. Note that
the CFSTRHANGTIME SFM policy attribute applies to any system using
SFM, whether or not SFM is in use throughout the sysplex.
The IBM® default value for CFSTRHANGTIME is 900 seconds (15 minutes). However, installations must ensure that the check parameters reflect an appropriate value. Consider CFSTRHANGTIME carefully to arrive at a value that reflects the needs, goals, and prior experiences for a given configuration. In general, it is desirable to select a fairly aggressive value to limit sympathy sickness when connectors fail to respond to events in a timely manner, but this must be balanced against the possibility of terminating connectors prematurely.
- z/OS® releases the check applies to:
- z/OS V1R12 and later.
- Parameters accepted:
- Yes. PARM('CFSTRHANGTIME(NO | seconds)'):
- NO
- Indicates that the system should not take automatic action to relieve a hang in a structure-related process.
- seconds
- Specifies the time interval, in seconds, that a coupling facility
structure connector can remain unresponsive before the system takes
action to relieve a hang in a structure-related process.
900 is the default value for this check parameter.
- The SFM policy specifies or defaults to CFSTRHANGTIME(NO), but the check parameter specifies a value other than NO.
- The SFM policy specifies a CFSTRHANGTIME decimal number of seconds, but the check parameter is either NO or a value less than the value specified in the SFM policy.
- 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.
ADDREPLACE POLICY[(policyname)] [STATEMENT(name)] UPDATE CHECK(IBMXCF,XCF_SFM_CFSTRHANGTIME) SEVERITY(MED) INTERVAL(004:00) DATE('date_of_the_change') PARM('CFSTRHANGTIME(900)') REASON('Your reason for making the update.')
- Reference:
- For more information, see z/OS MVS Setting Up a Sysplex.
- Messages:
- This check issues the following exception messages:
- IXCH0531E
- SECLABEL recommended for MLS users:
- SYSLOW