[Pacemaker] Need an idea for dynamic configuration dependng on resource distribution

[Andreas Mock]

-----Ursprüngliche Nachricht-----
Von: Andrew Beekhof <andrew at beekhof.net>
Gesendet: 27.04.2010 20:56:48
An: The Pacemaker cluster resource manager <pacemaker at oss.clusterlabs.org>
Betreff: Re: [Pacemaker] Need an idea for dynamic configuration dependng on resource distribution

>> configuration in the default case (everything o.k.). In this scenario the resources
>> shall take as much "server estate" as possible.
>
>"server estate" == RAM/CPU etc?
>And you can tell the app how much to use?


a) Yes
b) More or less. Think about mysql with innodb. One central variable is buffer_cache
which should be "as much as possible". When only one instance is running on a server
you can make a feasible guess, e.g. 80% of physical mem. As soon as two instances
are running on on server each instance can only have 80% / 2 of memory for buffer_cache.
As soon as you "overbook" real memory things go dramatically worse.

Any ideas?

Best regards
Andreas