[Linux-HA] external setting of node attributes?

[Michael Schwartzkopff]

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.

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
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