[Linux-cluster] ways used for auto-eviction clarifications

Lon H. Hohberger lhh at redhat.com
Wed Nov 11 16:37:59 UTC 2009

On Thu, 2009-11-05 at 02:17 +0100, Gianluca Cecchi wrote:
> Hello,
> can anyone summarize the possible events generating a self-eviction of
> a node for an rhcs cluster?
> Are these only executed via halt/reboot commands inside OS or also
> through connection to the self-fence-device?

linux-cluster does not generally have a notion of "self-fencing".

Unless there's a confirmed "dead" by another cluster member, the node is
considered alive.

self_fence in the 'fs.sh' script is an exception, but not the way you
might think...

The node calls 'reboot -fn' if the umount command fails.

However, this does /not/ obviate the requirement that another node
successfully fence the newly-rebooted node prior to allowing recovery.  

In effect, the node is rebooted twice: once by itself, and once by
another cluster member via iLO or whatever other power device you are

-- Lon

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