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From Ian Soboroff <isobor...@gmail.com>
Subject Re: Ideal configuration for given hardware
Date Mon, 24 May 2010 19:12:41 GMT
My data disks on two of my nodes are RAID-5, just because of circumstances.
My other nodes are JBOD.  I don't notice any real difference, but I haven't
strongly benched it.
Ian

On Mon, May 24, 2010 at 2:45 PM, Jonathan Ellis <jbellis@gmail.com> wrote:

> I can think of at least 2 clusters running 32GB boxes with single
> Cassandra processes on each.  (16 seems to be more common.)  At 64 I
> would seriously consider multiple processes per machine.  You'd want
> to configure a Snitch such that same-machine boxes were considered the
> same rack, there is no separate closeness level of same machine.
>
> At 32 I think you're fine with one process.  Watch for latency spikes
> and see how it goes.
>
> I would run raid 10 on the data disks if you can afford giving up the
> space, otherwise raid0.  I don't know that anyone's tested raid5.
>
> On Sun, May 23, 2010 at 3:30 PM, Aaron McCurry <amccurry@gmail.com> wrote:
> > I am planning on setting up a Cassandra cluster on a small 16 node
> cluster
> > (possibly 32 way).  Each machine has 8 cores 32 Gig of ram and 8 hds.  My
> > first thought is to setup one of those hds for the commit log, 6 for data
> > and leave one for the OS.  However I do have a concern about best
> utilizing
> > my memory, should I run a larger heap?  Should I run several cassandra
> > processes on the same box?
> > My concern about the larger heap is because GC's typically get slower.
>  And
> > if I run several procs, does cassandra realize that it's the same box for
> > replication purposes?
> > I do have other hd conf options, hardware RAID 0,1,or 5.
> > Just looking for some general configuration options as well as some real
> > world successes with similarly sized hardware.  Thanks!
> > Aaron
>
>
>
> --
> Jonathan Ellis
> Project Chair, Apache Cassandra
> co-founder of Riptano, the source for professional Cassandra support
> http://riptano.com
>

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