Storage Analysis situations

The predefined situations in this category monitor storage analysis. The description and formula for this situation follow.

Note:
All the attribute names in this group are prefixed with CICSplex_Storage_Analysis. except where stated.
CICSplex_DSAHigh_Warning
Warning threshold exceeded for high DSA usage.

Consider increasing the size of the CICS region and make the DSA larger. Increase the region size only if the Region Overview report shows adequate LSQA to support the change. It is also worth checking the current OSCOR usage. If the DSA size cannot be increased, consider reducing the CICS MAXTASK value.

Formula

If 
 the value of the attribute Percent_Used is greater than 70 
and 
 the value of the attribute Percent_Used is less than or equal to
90 
and 
 the value of the attribute Area equals DSA
CICSplex_DSAHigh_Critical
Critical threshold exceeded for high DSA usage.

Consider increasing the size of the CICS region and make the DSA larger. Increase the region size only if the Region Overview report shows adequate LSQA to support the change. It is also worth checking the current OSCOR usage. If the DSA size cannot be increased, consider reducing the CICS MAXTASK (MXT) value.

Formula

If 
 the value of the attribute Percent_Used is greater than 90 
and 
 the value of the attribute Area equals DSA
CICSplex_DSALow_Warning
Warning threshold exceeded for low DSA usage.

If this situation fires consistently, it can indicate an excessive DSA size. Decrease the size of the DSA for the CICS region. If there are very few tasks, there might be very little DSA in use. Consider increasing the maximum number of tasks (MXT CICS can process at one time.

Formula

If 
 the value of the attribute Percent_Used is less than 35 
and 
 the value of the attribute Percent_Used is greater than or equal
to 15 
and 
 the value of the attribute Area equals DSA
CICSplex_DSALow_Critical
Critical threshold exceeded for low DSA usage.

If this situation fires consistently, it can indicate an excessive DSA size. Decrease the size of the DSA for the CICS region. If there are very few tasks, there might be very little DSA in use. Consider increasing the maximum number of tasks (MXT CICS can process at one time.

Formula

If 
 the value of the attribute Percent_Used is less than 15 
and 
 the value of the attribute Area equals DSA
CICSplex_DSAAvail_Warning
Warning threshold exceeded for low DSA availability.

Ensure that the predicates in this situation are set to trip only when available storage before SOS is critically small. DSA extents are al located in units of 256KB. The exception to this is the user DSA which is 1MB when storage isolation is active. Change the DSALIM parameter for the CICS address space to increase the storage available to CICS.

Formula

If 
 the value of the attribute Storage_Available is less than 768 
and 
 the value of the attribute Storage_Available is greater than or
equal to 256 
and 
 the value of the attribute Area equals DSA
CICSplex_DSAAvail_Critical
Critical threshold exceeded for low DSA availability.

Ensure that the predicates in this situation are set to trip only when available storage before SOS is critically small. DSA extents are allocated in units of 256 kilobytes. The exception to this is the user DSA, which is 1 megabyte when storage isolation is active. Change the DSALIM parameter for the CICS address space to increase the storage available to CICS.

Formula

If 
 the value of the attribute Storage_Available is less than 256 
and 
 the value of the attribute Area equals DSA
CICSplex_EDSAHigh_Warning
Warning threshold exceeded for high EDSA usage.

Increase EDSALIM in the CICS System Initialization Table. The Storage Analysis report will provide an overview of storage availability with in each constituent EDSA. For task and CICS component storage usage, consult the storage displays offered by OMEGAMON XE for CICS.

Formula

If 
 the value of the attribute Percent_Used is greater than 70 
and 
 the value of the attribute Percent_Used is less than or equal to
90 
and 
 the value of the attribute Area equals EDSA
CICSplex_EDSAHigh_Critical
Critical threshold exceeded for high EDSA usage.

Increase EDSALIM in the CICS System Initialization Table. The Storage Analysis report will provide an overview of storage availability with in each constituent EDSA. For task and CICS component storage usage, consult the storage displays offered by OMEGAMON XE for CICS.

Formula

If 
 the value of the attribute Percent_Used is greater than 90 
and 
 the value of the attribute Area equals EDSA
CICSplex_EDSALow_Warning
Warning threshold exceeded for low EDSA usage.

If this situation trips consistently, it can indicate an excessive EDSA size. Decrease EDSALIM in the SIT. For current task storage, use the storage display functions found in Tivoli OMEGAMON XE for CICS on z/OS. If there are very few tasks, as shown in the Transaction Analysis report, there might be little EDSA in use.

Formula

If 
 the value of the attribute Percent_Used is less than 35 
and 
 the value of the attribute Percent_Used is greater than or equal
to 15 
and 
 the value of the attribute Area equals EDSA
CICSplex_EDSALow_Critical
Critical threshold exceeded for low EDSA usage.

If this situation trips consistently, it can indicate an excessive EDSA size. Decrease EDSALIM in the SIT. For current task storage, use t he storage display functions found in Tivoli OMEGAMON XE for CICS on z/OS. If there are very few tasks, as shown in the Transaction Analysis report, there might be little EDSA in use.

Formula

If 
 the value of the attribute Percent_Used is less than 15 
and 
 the value of the attribute Area equals EDSA
CICSplex_DSASOS_Warning
Warning threshold exceeded for DSA short-on-storage.

Use the storage displays of Tivoli OMEGAMON XE for CICS on z/OS to locate tasks that are u sing a large amount of DSA. Verify that their storage requests are for a reasonable amount of memory. To determine if a given task is hung in a storage control request, go to the Transaction Analysis report and look at the Wait Type field. Consider using the CICS CEMT transaction or the KILL option of Tivoli OMEGAMON XE for CICS on z/OS to purge the offending task.

Formula

If 
 the value of the attribute SOS equals Yes
and
 the value of the attribute Area equals DSA
CICSplex_DSASOS_Critical
Critical threshold exceeded for DSA short-on-storage.

Use the storage displays of Tivoli OMEGAMON XE for CICS on z/OS to locate tasks that are u sing a large amount of DSA. Verify that their storage requests are for a reasonable amount of memory. To determine if a given task is hung in a storage control request, go to the Transaction Analysis report and look at the Wait Type field. Consider using the CICS CEMT transaction or the KILL option of Tivoli OMEGAMON XE for CICS on z/OS to purge the offending task.

Formula

If 
 the value of the attribute SOS equals Yes 
and 
 the value of the attribute Area equals DSA
CICSplex_EDSASOS_Warning
Warning threshold exceeded for EDSA short-on-storage.

Use the storage displays of Tivoli OMEGAMON XE for CICS on z/OS to locate tasks that are using a large amount of DSA. Verify that their storage requests are for a reasonable amount of memory. To determine if a given task is hung in a storage control request, go to the Transaction Analysis report and look at the Wait Type field. Consider using the CICS CEMT transaction or the KILL option of Tivoli OMEGAMON XE for CICS on z/OS to purge the offending task.

Formula

If 
 the value of the attribute SOS equals Yes 
and 
 the value of the attribute Area equals EDSA
CICSplex_EDSASOS_Critical
Critical threshold exceeded for EDSA short-on-storage.

Use the storage displays of Tivoli OMEGAMON XE for CICS on z/OS to locate tasks that are u sing a large amount of DSA. Verify that their storage requests are for a reasonable amount of memory. To determine if a given task is hung in a storage control request, go to the Transaction Analysis report and look at the Wait Type field. Consider using the CICS CEMT transaction or the KILL option of Tivoli OMEGAMON XE for CICS on z/OS to purge the offending task.

Formula

If 
 the value of the attribute SOS equals Yes 
and 
 the value of the attribute Area equals EDSA
CICSplex_EDSAAvail_Warning
Warning threshold exceeded for low EDSA availability.

Ensure that the predicates in this situation are set to trip only when available storage before SOS is critically small. EDSA extents are allocated in units of 1MB. Change the EDSALIM parameter for the CICS address space to increase the storage available to CICS.

Formula

If 
 the value of the attribute Storage_Available is less than 3072 
and 
 the value of the attribute Storage_Available is greater than or
equal to 1024 
and 
 the value of the attribute Area equals EDSA
CICSplex_EDSAAvail_Critical
Critical threshold exceeded for low EDSA availability.

Ensure that the predicates in this situation are set to trip only when available storage before SOS is critically small. EDSA extents are allocated in units of 1MB. Change the EDSALIM parameter for the CICS address space to increase the storage available to CICS.

Formula

If 
 the value of the attribute Storage_Available is less than 1024 
and 
 the value of the attribute Area equals EDSA

See also the CICSplex Storage Analysis attribute group.