You can increase the size of the cluster page pool and/or modify the warning level for the cluster page pool while the UTM cluster application is running. To do this, you, in principle, perform an update generation of the KDCFILE as described in section "Update generation of the KDCFILE". However, you should note the following:
Enter the new values for the size and/or warning level in the PGPOOL operand of the CLUSTER statement. You may only increase the size of the cluster page pool. It is not possible to reduce the size online!
Perform the KDCDEF run. When you do this, enter only OPTION GEN=KDCFILE. You must not specify GEN=CLUSTER!
Make sure that sufficient disk storage space is available for the enlarged cluster page pool files since this is not checked at generation time.
The remaining steps are similar to the procedure described above (see steps 5 through 9 in section "Update generation of the KDCFILE"), i.e. you update all the active node applications to the current generation state one after the other.
The change to the warning level or the increase in the size of the cluster page pool takes effect as soon as all the running node applications have been restarted with the newly generated KDCFILE.
The size of the cluster page pool files is increased by the running UTM cluster application and the additional pages are taken into account when new pages are reserved for the relevant nodes.