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From Jonathan Ellis <>
Subject Re: Cassandra scaling problem in virtualized environment
Date Wed, 13 Jul 2011 02:12:19 GMT
As Ryan said, Cassandra's really designed to manage DAS.  That's
probably a big part of the problem.

If you have to use a SAN, I recommend checking out this thread:

On Tue, Jun 14, 2011 at 8:16 AM, Schuilenga, Jan Taeke
<> wrote:
> Hi All,
> We are having issues testing Cassandra in a virtualized environment (Vmware
> ESX).
> Our challenge is to combine a  high number of concurrent users with a very
> low maximum response time.
> Immediately we ran into a problem with scalability where our performance
> (Trx per sec) unexpectedly degrades after adding nodes without
> overcommitting host cpu resources too much as far as we can tell.
> Therefore we are looking for bestpractices or anybody with experiences with
> cassandra in a similar environment to help us.
> So far we only found the following article which hasn’t helped so far:
> Our current test setup using the java version of the cassandra load tool
> consists of:
> Hardware: Vmware ESX cluster with IBM 3850 (4x dual core cpu) Hosts on
> Compellent FC SAN for storage
> Cassandra: 3-6 node 2vCpu Centos guest boxes (RF=2)
> Jan-Taeke Schuilenga

Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support

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