If you have configured multiple fencing agents, you may want to set different fencing levels. Fencing levels enable you to prioritize different approaches to fencing and can provide a valuable mechanism for fallback options should your default fencing mechanism fail.

Each fencing level is attempted in ascending order, starting from level 1. If the fencing agent that is configured for a particular level fails, the fencing agent from the next level is then attempted, and so on.

For example, you may wish to configure IPMI-LAN fencing at level 1, but fallback to IF-MIB fencing as a level 2 option. Using the example configurations from Fencing Configuration Examples, you would run the following commands on one of the nodes to set the fencing levels for each configured agent:

sudo pcs stonith level add 1 node1 ipmilan_n1_fencing
sudo pcs stonith level add 1 node2ipmilan_n2_fencing
sudo pcs stonith level add 2 node1ifmib_n1_fencing
sudo pcs stonith level add 2 node2ifmib_n2_fencing