[Linux-HA] Groups vs colocations.... etc
akurz at sms.at
Fri Dec 8 16:03:38 MST 2006
>> Andrew Beekhof wrote:
>> > On 12/7/06, Andrew Beekhof <beekhof at gmail.com> wrote:
>> > let me get back to you...
>> > as of this version it should work:
>> > http://hg.beekhof.net/lha/crm-stable/rev/1045cec0d37d
>> Thanks! I have done some tests with ptest, and it works .... but only
>> for primitives and not for a group. Is there a special reason for that?
>i wish i'd never agreed to support groups :)
Why? I really like them :-)
>groups are a non-atomic resource and can't be considered to be running
>anywhere themselves (groups aren't always collocated although this is
>the most common configuration). so any rules that use node attributes
>will only make sense for the contents of the group and not the group
Yes, that is clear but like groups make all co-location constrainst automatically,
I thought it would be a convient way to pass my node specific attributes to all
resources in the group.
> Hmmm ... so the score from the location constraint is only added to the
> first resource in the group.
>it should pass it on to the rest of them but its effect is not multiplied
> The default-resource-stickiness is added to
> every resource in the group.
> The node specific failure stickiness is
> deleted from the resources with fail-counts.
> But the result of the
> group score
> the group itself doesnt have a score - i'm not sure what you mean here
I mean the sum of the scores of the resources in this group.
> only includes the values from the first resource in the
> group and resources with a negative score do not initiate a failover of
> the group like in 2.0.7. So at the moment the failure-stickiness feature
> works only for the first resource in a group, is that correct?
>if you send me the config i might be able to comment more - it helps
>to have all the pieces
Oh, sorry .... sounds like a good idea :-)
I've attached my config, I've added the fail counts by hand to that cib
and did my tests with ptest, version 1045cec0d37d.
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