On Fri, Dec 4, 2009 at 1:31 PM, Freeman, Tim <tim.free...@hp.com> wrote: >>Fundamentally there's only so much I/O you can do at a time. If you >>don't have enough, you need to upgrade to servers with better i/o >>(i.e. not EC2: http://pl.atyp.us/wordpress/?p=2240&cpage=1) and/or >>more ram to cache the reads against. > > I agree that any given configuration will support a limited amount of I/O. > > For the first few hours of my load test, I have enough I/O. The problem is > that Cassandra is spending too much I/O on reads and writes and too little on > compactions to function well in the long term.
If you don't have enough room for both, it doesn't matter how you prioritize.
