Andrew Beekhof wrote:
On Oct 30, 2007, at 2:44 AM, Alan Robertson wrote:
Hi,
I've been working with a customer - trying to get them up and running
on version 2.1.2. I got everything to work except for one thing:
They require that their web server fail over on the 3rd failure. I
read the documentation on the failcount stuff on the web site here:
http://www.linux-ha.org/v2/faq/forced_failover
I think I understood it, and I created a CIB to match. In the CIB I
created, I believe it should fail over on the 3rd failure. In
practice it fails over reliably on the 9th iteration instead. We had
been doing a "killall httpd" to fail the web server.
9th is correct.
As has been explained here on the list a number of times, the group's
stickiness is N * default-resource-stickiness, where N is the number of
resources in the group.
Including the rsc_location constraint, the group stickiness is therefor:
4 * 20 + 1 = 81
So clearly apache is going to need to fail 9 times (9 *
default-resource-failure-stickiness = -90) before the group is moved.
Of course it all starts getting even more complicated when one starts
creating rsc_colocation constraints with other groups and primitives.
Can I specify the resource-failure-stickiness of a group either
explicitly or implicitly?
Since I'm writing this up for the web site, I want to make sure I have
this absolutely clear so I can write it up correctly:
Do you mean that you sum up the stickiness values for each resource in
the group, or did you really mean that you it always uses n*default
stickiness? (I'm asking for both for failure stickiness and resource
stickiness).
If I have a locational constraints for a group of 'p' points, does that
then distribute across the group of 'n' nodes so that we get a group
preference of 'p' * 'n' points? Or is it just just a total of 'p'
points for the group as a whole?
My current attempt to document this can be found here:
http://linux-ha.org/v2/faq/forced_failover
--
Alan Robertson <[EMAIL PROTECTED]>
"Openness is the foundation and preservative of friendship... Let me
claim from you at all times your undisguised opinions." - William
Wilberforce
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