[Linux-HA] external setting of node attributes?

[Andreas Kurz]

On Mon, Mar 3, 2008 at 2:39 PM, Michael Schwartzkopff <misch at multinet.de> wrote:
> Am Montag, 3. März 2008 14:19 schrieb b52 at entrap.de:
>  (...)
>
> > >> I am using HA-V2 and would like to implement a script or program
>  > >> which can be used for real load balancing. It should run every x
>  > >> seconds and determine the cpu+IO load of the host and change a
>  > >> regarding node attribute. Then crm should use this attribute and a
>  > >> threshold in location constraints to place a resource at a better
>  > >> host (with less load).
>  (...)
>
> > All I need is a possibility to tell crm which node has how much load.
>  > Does someone know how to achieve that?
>
>  1) write a script that measures the load of every node. Take the 5 min
>  average! See damping below for explanation.

Or give the already included 'SysInfo' OCF RA a try.

>
>  2) user attrd_updater to write these values into the status section of the
>  nodes. Something like:
>  attrd_updater -n cpu_load -v <load> -d 15
>  Perhaps you need to adapt damping (-d)
>
>  3) use the score_attribute to distribute the resources. See
>  http://www.linux-ha.org/CIB/Idioms/PingdAttrAsScore
>  and
>  http://www.linux-ha.org/v2/faq/pingd
>
>  Make extensive use of resource_stickiness to find a good balance between
>  moving resources and overload on one node.
>
>  Post your config, if it works!
>
>  --
>  Dr. Michael Schwartzkopff
>  MultiNET Services GmbH
>  Addresse: Bretonischer Ring 7; 85630 Grasbrunn; Germany
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>
>  mail: misch at multinet.de
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>
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>  ---
>
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>
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