On 19/11/13 14:06, Andrey Groshev wrote: > > > 19.11.2013, 22:30, "Lars Marowsky-Bree" <l...@suse.com>: >> On 2013-11-19T22:10:29, Andrey Groshev <gre...@yandex.ru> wrote: >> >> First, like digimer wrote, clearly stonith-by-ssh is useless for >> production since you can't fence nodes that are having problems. But for >> testing, it's worth a try. > > Maybe I do not quite understand correctly the term "fence" > If I want I can restart the server with the software profile, which will turn > off all services except SSH.
Fencing is designed to put a node in an unknown state into a known state. It guarantees that a node will not offer clustered services or access clustered resources after it is declared lost. Without fencing, a condition called "split-brain" (two or more nodes offering the same HA services at the same time without coordinating) becomes very possible. With shared storage, data divergence and data loss are also quite possible. Fencing, when used properly, prevents these conditions from occurring. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education? _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
