IMS Status situations
You can monitor exceptions that occur when the IMS system is in specific states.
- IMS_Inactive
- This exception will trip if the IMS system
is currently in shutdown status, but has not yet completed. If this
condition persists, it might be an indication that one or more of
the regions associated with the IMS system
has abended during the shutdown process.
The formula is:
IMS_STATUS.IMS_Shutdown_In_Progress EQ True - IMS_LogTape_Writeahead
- The Write Ahead capability enables the system to write data quicker
by insuring that the resources needed for writing the data are available.
If this facility is not active, then some writes will take longer
to perform. Verify that write-ahead is enabled for the IMS system.
The formula is:
IMS_STATUS.Log_Tape_Write-ahead EQ Inactive - IMS_LU_Status
- The logical unit status is inactive, which is an indication that
many of your physical terminals will not be able to connect to the IMS system. Verify that the VTAM® system is functioning properly.
The formula is:
IMS_STATUS.APPC_IMSLU_Status EQ Inactive - IMS_Online_Change_Active
- The system has detected that an online change is currently active
in the IMS system. This in itself
is not a problem, however the status eventually changes to inactive
after the online change has completed. If it does not, it is an indication
that the online changes are not completing properly.
The formula is:
IMS_STATUS.Online_Change_in_Progress EQ True - IMS_Online_Change_Occurred
- This is an indication that at least one online change has occurred
during the running of this IMS system.
The formula is:
IMS_STATUS.Online_Change_has_Occurred EQ Yes - IMS_Parallel_DLI_Status
- The Parallel DLI facility is inactive which will reduce the capability
of the IMS system to run concurrent
DLI requests. Verify that the facility is enabled for the IMS system.
The formula is:
IMS_STATUS.Parallel_DL/I_Status EQ Inactive - IMS_Physical_Logger_SVC
- The task responsible for doing physical logging for IMS is currently in SVC wait. If this condition
persists, then the logging activities for the IMS system will end up being delayed and cause
the performance of the IMS applications
to suffer.
The formula is:
IMS_STATUS.Physical_Logger_TCB_In_SVC EQ True - IMS_Start_DC
- The Start DC command was not issued for this system. If it is
desired, issue the start now.
The formula is:
IMS_STATUS.Start_DC_Performed EQ False - IMS_Tasks_Waiting_Critical
- The number of IMS tasks that
are waiting has exceeded the threshold. This is an indication that
the system is not running as expected and you need to determine why
the tasks are not active.
The formula is:
IMS_STATUS.ITASKs_Waiting GE 50 - IMS_Tasks_Waiting_Warning
- The number of IMS tasks that
are waiting has exceeded the threshold. This is an indication that
the system is not running as expected and you need to determine why
the tasks are not active.
The formula is:
IMS_STATUS.ITASKs_Waiting GE 40 AND IMS_STATUS.ITASKs_Waiting LT 50 - IMS_TCO_Inactive
- The Time Control facilities within IMS are
not active. If TCO is needed, reconfigure the system to make it available.
The formula is:
IMS_STATUS.TCO_Status EQ Inactive - IMS_VTAM_ACB_Status
- The VTAM ACB currently
has a status of Closed and cannot be used. This will cause connection
problems for the physical terminals to IMS.
Check the status of the VTAM started
tasks to make sure they are running properly. You might need to contact
your organization's operations group to determine if there is a network
problem in the data center.
The formula is:
IMS_STATUS.VTAM_ACB_Status EQ Closed - IMS_VTAM_Auth_Path
- The VTAM authorized path
has a status of inactive. This limits the capability of VTAM to perform authorization, which can prevent
users from accessing the IMS system.
Verify that VTAM is properly
defined.
The formula is:
IMS_STATUS.VTAM_Authorized_Path_Status EQ Inactive - IMS_Waiting_Dyn_SAP
- The system is waiting on dynamic SAP (save area prefix), which
can cause delays to the applications. Verify that the SAP is functioning
properly.
The formula is:
IMS_STATUS.Waiting_On_Dynamic_SAPs EQ True - IMS_WaitSVC
- The control task has a TCB (task control block) in SVC (SuperVisor
Call Routine) wait. This can slow down the performance of the IMS system if it persists. Verify
that the job for the IMS control
region has abnormally terminated or is in the process of generating
a dump.
The formula is:
IMS_STATUS.Control_Task_TCB_in_SVC EQ True