Preparing for Installation › Configure CA Insight DPM for Use with CA Cross-Enterprise APM

Configure CA Insight DPM for Use with CA Cross-Enterprise APM

Recommendations:

1. To allow uninterrupted monitoring of the DB2 subsystem, set up the data collector and PC tasks as started tasks that start automatically upon initial program load (IPL).
2. After the started tasks are defined, set the dispatching priority for the data collector task as follows:
   • Just below the IRLM dispatching priority
   • Above the DB2 address spaces and DB2 applications

   The dispatching priority must be high enough to minimize the chance of lost DB2 trace data.

3. Create an OBID translation file during the installation process. CA Insight DPM uses this file to translate pageset, index, and table OBIDs into the actual object names. This file collects data that is more meaningful to your business. This practice allows CA Insight DPM online displays to show object names rather than DBID or OBID numbers.
4. The data collector must have enough trace buffer space to collect trace data. Otherwise, the buffers overflow and trace data is lost.

   Two sets of buffers are involved:

   • Buffers that are located in common service area (CSA)

     DB2 (instrumentation facility interface (IFI) or service trace exit) uses these buffers to pass trace data to the data collector.

   • Buffers residing in the data collector private area

     These buffers flush the CSA buffers and process the records.

   The following data collector SYSPARM options control these buffers:

   SRVBUFSZ and SRVBUFNUM

   Control the size of the CSA trace buffers.

   PRVBUFNUM and PRVMAXSZ

   Control the size of the private area buffers.

   Set your parameters based on the following information:

   • Type of DB2 subsystem being monitored
   • Expected trace workload (such as the volume of trace data)
   • Current system paging rate

   Higher buffer sizes reduce the chance of lost trace data but increase the demand on real, common, and virtual storage.

   On higher-volume systems, we recommend the following settings (to start with a CSA buffer allocation of 4 MB):

   • SRVBUFSZ=8
   • SRVBUFNUM=128
   • PRVBUFNUM=128
   • PRVMAXSZ=4096

   On a low-volume system, use the following default values:

   • SRVBUFSZ=8
   • SRVBUFNUM=8
   • PRVBUFNUM=12
   • PRVMAXSZ=1024

   Note: You can use the INS IFI command from the user interface to determine the current CSA (IFI monitor size) and private buffer sizes in use. This command also shows the number of trace records that have been lost due to unavailable buffers. If records are being lost and the dispatching priority of the data collector is appropriate, increase these values to reduce the number of lost records.

5. CA Insight DPM has a limited number of displays to combine data from members of a data-sharing group. If the data collector is monitoring a data-sharing DB2 subsystem, we recommend enabling the data-sharing option.