[Gllug] Identifying what processes are waiting on IO

[Luke Dudney]

On 7/12/08 2:18 PM, John Hearns wrote:
> Once you've identified the processes and disk devices which are 
> causing the problems,
> then maybe a bit of lateral thought can help. As a for instance, one 
> of the applications I'm familiar with, Ganglia, uses a 
> round-robin-tool database, which is frequently updated with 
> information from Beowulf cluster nodes - so frequently that on a big 
> cluster the didks are just continually busy. The recognised fix is to 
> write the data to a RAMdisk then flush to real disk every so often.

This is an excellent read on the topic of RRD I/O:

http://net.doit.wisc.edu/~plonka/lisa/lisa2007/bigmrtg-lisa-talk.pdf


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