The example on the site http://www.linux-ha.org/v2/faq/forced_failover confused
me quite a while ago:
Zit.:"[...]
In the first example above (where default-resource-failure_stickiness is -100)
my_rsc can fail up to 15 times on nodeA before Heartbeat will no longer
consider running it there. Likewise it can fail up to 10 times on nodeB before
that node will no longer be consider either.
In the second example (where default-resource-failure-stickiness is less than
-500), these values drop to 3 and 2 failures respectively.
[...]"
With this data being the aforementioned example:
Zit.:"[...]
In a cluster where:
*
default-resource-failure-stickiness is -100
*
default-resource-stickiness is 500
*
Resource my_rsc prefers to run on nodeA with score 1500
*
Resource my_rsc prefers to run on nodeB with score 1000
my_rsc can fail up to ten times on nodeA before being moved to nodeB.
(nodeA score - nodeB score + stickiness) / abs(failure stickiness)
==> (1500 - 1000 + 500) / abs(-100)
==> 1000 / 100
==> Answer: 10
[...]"
Why is it one time "[...] can fail up to ten times on nodeA before being moved
to nodeB [...]" and another time "[...]In the first example above (where
default-resource-failure_stickiness is -100) my_rsc can fail up to 15 times on
nodeA before Heartbeat will no longer consider running it there [...]"? I mean
it couldn't reach 15 times as it would me migrated away after ten failures
anyway in this example? (depending on the example's calculation algorithm of
course, by experience I know that it is on 2.0.7 at least 4*
default-resource-failure-stickiness with co-location enabled etc. and
fail-count starts counting AFTER the first failure)?
With regards,
Markus
--
i.A. Markus Saul
Network & System Administration
Danet GmbH, Gutenbergstraße 10, 64331 Weiterstadt, Germany
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