Re: [ClusterLabs] Query about resource stickiness

[Kostiantyn Ponomarenko]

Phanidhar,

If you don't have any location rules in your cluster, you can try setting
"resource-stickiness=1" or "resource-stickiness=100".
That will do the same job as INFINITY if there is no other location rules
in the cluster.
Also, there is a way to see current state of scores in the cluster, which
helps a lot =).
Try this command:

# crm_simulate -Ls


Thank you,
Kostia

On Fri, Nov 18, 2016 at 12:01 PM, phanidhar prattipati <
p.phanid...@gmail.com> wrote:

> Thanks for the prompt reply Ken.
>
> In my configuration none of my resource have any node priorities set but
> in 3 node when one nodes goes down and is added back to the cluster some
> times resources are getting struck between newly added node and on other
> node where it is presently running after setting resource stickiness to
> INFINITY and also sometimes i am getting CPU struck for 30 seconds error
> message and reboots the other node.
>
> So want sure if its right way of doing it.
>
> Thanks,
> Phanidhar
>
>
>
> On Fri, Nov 18, 2016 at 1:16 AM, Ken Gaillot  wrote:
>
>> On 11/17/2016 06:41 PM, phanidhar prattipati wrote:
>> > Good Morning All,
>> >
>> > I have configured HA on 3 nodes and in order to disable automatic fail
>> > over i need to set resource stickiness value and not sure how to
>> > calculate it. Currently i set it o INFINITY which i believe is not the
>> > right way of doing it. Any pointers how to calculate based on the
>> > environment set up will be really great help?
>> >
>> >
>> > --
>> > Thanks,
>> > Phanidhar
>>
>> INFINITY is fine -- many people use that for stickiness.
>>
>> It's simply a matter of preference. How it matters is when weighing
>> against other scores in your configuration.
>>
>> For example, let's say you have a resource R with a location constraint
>> preferring node N, and you have resource stickiness.
>>
>> If N crashes or is shut down, R will move to another node. When N comes
>> back, R will stay on the other node, if the resource stickiness is
>> higher than the location constraint's score; it will move back to N, if
>> the location constraint's score is higher.
>>
>> A score of INFINITY means never move back, as long as the new node stays
>> up.
>>
>> ___
>> Users mailing list: Users@clusterlabs.org
>> http://clusterlabs.org/mailman/listinfo/users
>>
>> Project Home: http://www.clusterlabs.org
>> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
>> Bugs: http://bugs.clusterlabs.org
>>
>
>
>
> --
> Thanks,
> Phanidhar
> 07725162795
>
> ___
> Users mailing list: Users@clusterlabs.org
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>
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> Bugs: http://bugs.clusterlabs.org
>
>
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Re: [ClusterLabs] Query about resource stickiness

[phanidhar prattipati]

Thanks for the prompt reply Ken.

In my configuration none of my resource have any node priorities set but in
3 node when one nodes goes down and is added back to the cluster some times
resources are getting struck between newly added node and on other node
where it is presently running after setting resource stickiness to INFINITY
and also sometimes i am getting CPU struck for 30 seconds error message and
reboots the other node.

So want sure if its right way of doing it.

Thanks,
Phanidhar



On Fri, Nov 18, 2016 at 1:16 AM, Ken Gaillot  wrote:

> On 11/17/2016 06:41 PM, phanidhar prattipati wrote:
> > Good Morning All,
> >
> > I have configured HA on 3 nodes and in order to disable automatic fail
> > over i need to set resource stickiness value and not sure how to
> > calculate it. Currently i set it o INFINITY which i believe is not the
> > right way of doing it. Any pointers how to calculate based on the
> > environment set up will be really great help?
> >
> >
> > --
> > Thanks,
> > Phanidhar
>
> INFINITY is fine -- many people use that for stickiness.
>
> It's simply a matter of preference. How it matters is when weighing
> against other scores in your configuration.
>
> For example, let's say you have a resource R with a location constraint
> preferring node N, and you have resource stickiness.
>
> If N crashes or is shut down, R will move to another node. When N comes
> back, R will stay on the other node, if the resource stickiness is
> higher than the location constraint's score; it will move back to N, if
> the location constraint's score is higher.
>
> A score of INFINITY means never move back, as long as the new node stays
> up.
>
> ___
> Users mailing list: Users@clusterlabs.org
> http://clusterlabs.org/mailman/listinfo/users
>
> Project Home: http://www.clusterlabs.org
> Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf
> Bugs: http://bugs.clusterlabs.org
>



-- 
Thanks,
Phanidhar
07725162795
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Re: [ClusterLabs] Query about resource stickiness

[Ken Gaillot]

On 11/17/2016 06:41 PM, phanidhar prattipati wrote:
> Good Morning All,
> 
> I have configured HA on 3 nodes and in order to disable automatic fail
> over i need to set resource stickiness value and not sure how to
> calculate it. Currently i set it o INFINITY which i believe is not the
> right way of doing it. Any pointers how to calculate based on the
> environment set up will be really great help?
> 
> 
> -- 
> Thanks,
> Phanidhar

INFINITY is fine -- many people use that for stickiness.

It's simply a matter of preference. How it matters is when weighing
against other scores in your configuration.

For example, let's say you have a resource R with a location constraint
preferring node N, and you have resource stickiness.

If N crashes or is shut down, R will move to another node. When N comes
back, R will stay on the other node, if the resource stickiness is
higher than the location constraint's score; it will move back to N, if
the location constraint's score is higher.

A score of INFINITY means never move back, as long as the new node stays up.

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[ClusterLabs] Query about resource stickiness

[phanidhar prattipati]

Good Morning All,

I have configured HA on 3 nodes and in order to disable automatic fail over
i need to set resource stickiness value and not sure how to calculate it.
Currently i set it o INFINITY which i believe is not the right way of doing
it. Any pointers how to calculate based on the environment set up will be
really great help?


-- 
Thanks,
Phanidhar
___
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