[Linux-HA] placement of stonith resources

Lars Marowsky-Bree lmb at suse.de
Wed Feb 1 09:23:50 MST 2006

On 2006-02-01T17:12:02, Andrew Beekhof <abeekhof at suse.de> wrote:

> >But, the ``start_prereq=none'' on all STONITH resources should _still_
> >solve this and allow the stonith for A & B to be instantiated on some
> >other node, no?
> No - because that would make it "active" more than once.
> start_prereq only kicks in when the resource isnt running anywhere.

That sort of defeats the purpose of what start_prereq was meant to
provide, no? Namely exactly the ability to start again w/o fencing, for
example for self-fencing resources.

Assume a cluster of 5 nodes, a power switch capable of 2 concurrent
connections, and now the 2 nodes holding these die. "Duh." Or even a
power switch capable of switching 8 nodes but only a single concurrent
connection (which is quite common), and now you lose just _one_ node and
can't proceed.

-> Blocker bug.

    Lars Marowsky-Brée

High Availability & Clustering
SUSE Labs, Research and Development
SUSE LINUX Products GmbH - A Novell Business	 -- Charles Darwin
"Ignorance more frequently begets confidence than does knowledge"

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