You can make changes to the saved or shadow CIB and simulate it again, to see how Pacemaker would react differently. You can edit the XML by hand, use command-line tools such as cibadmin with either a shadow CIB or the CIB_file environment variable set to the filename, or use higher-level tool support (see the man pages of the specific tool you’re using for how to perform actions on a saved CIB file rather than the live CIB).

You can also inject node failures and/or action failures into the simulation; see the crm_simulate man page for more details.

This capability is useful when using a shadow CIB to edit the configuration. Before committing the changes to the live cluster with crm_shadow --commit, you can use crm_simulate to see how the cluster will react to the changes.