According to this knowledge base article at redhat, https://access.redhat.com/kb/docs/DOC-39336, the /sbin/fence_ilo script should work with iLO3. I am using the version of cman mentioned in the article. The iLO3 firmware is at the latest revision 1.16. The fence_ilo script just returns a connect/login error as follows: [root@node01 ~]# /sbin/fence_ilo -o status -a '10.39.170.233' -l mitel -p ilopassword -v Unable to connect/login to fencing device The login credentials are correct as I can connect via ssh: [root@node01 ~]# ssh mitel@10.39.170.233 mitel@10.39.170.233's password: User:mitel logged-in to ILOUSE103N281.(10.39.170.233) iLO 3 Standard 1.16 at Dec 17 2010 Server Name: host is unnamed Server Power: On </>hpiLO-> Is their anything else that needs to be done to execute the script successfully? The fence_ilo script works on previous iLO versions. Linked Article: Issue * How do I set up HP iLO3 as a fence device in a Red Hat Cluster Suite (RHCS) cluster? * Why does fencing fail on Red Hat Cluster Suite when using HP's iLO3? Environment * Red Hat Enterprise Linux (RHEL) 5 * Red Hat Enterprise Linux 6 * Red Hat Cluster Suite * HP iLO3 Resolution Support for the iLO3 fence device in RHEL5 has been added with the release of cman 2.0.115-34.el5_5.4 through erratum RHEA-2010-0876. No special setup is required after installing this erratum to get the iLO3 to work. HP has also released new firmware to address an issue with fence_ipmi which could cause the server to be powered on instead of off. We therefore advise you to upgrade to firmware version 1.15 (28 Oct 2010) as provided by HP. For installation instructions or problem resolution with this firmware version we refer you to the HP website. Root Cause HP iLO3 was not supported by fence_ilo.