Now that is way interesting.  Maybe if you do that, you can put a huge
grid on a real disk instead of tmpfs?  I might have to try that...

-twitham

-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Jesse Becker
Sent: Wednesday, March 12, 2008 1:27 PM
To: Martin Hicks
Cc: [email protected]
Subject: Re: [Ganglia-general] Setup large clusters

On Wed, Mar 12, 2008 at 11:35 AM, Martin Hicks <[EMAIL PROTECTED]> wrote:
>
>  Hi,
>
>  I'm wondering what the suggested setup is for a large Grid.  I'm
having
>  trouble with scalaing ganglia to work on large clusters.

Have you considered turning off disk read-ahead on the partition that
includes the .rrd files?  That should help somewhat.  There's a good
paper that discusses the performance of MRTG (a heavy user of
rrdtool), and how to make it scale nicely:
http://www.usenix.org/event/lisa07/tech/plonka.html

Note that the patch to rrdtool mentioned in in the paper is includined
in rrdtool 1.2.24 and later.




-- 
Jesse Becker
GPG Fingerprint -- BD00 7AA4 4483 AFCC 82D0 2720 0083 0931 9A2B 06A2

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