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From "David Dabbs" <>
Subject RE: Experiences with Cassandra hardware planning
Date Mon, 25 Oct 2010 05:36:21 GMT

Thanks for the detailed post! Did you need to start your JVMs with numactl
in order to take advantage of NUMA?
I know the board, OS and JVM must  be configured properly, but it's not
clear if the JVMs must be started with numactl.



From: Eric Rosenberry [] 
Sent: Sunday, October 24, 2010 10:17 PM
Subject: Experiences with Cassandra hardware planning


Over the past nine months I have been working to tune our hardware
configuration to optimally balance CPU/RAM/disk/iops/network per node for
our Cassandra workload.  Thanks much to those here who have provided helpful

I wanted to share back to the community some of the learnings we have come
across including the hardware configuration we have been successful with
(YMMV).  This is still a work in progress naturally.

I have written up a detailed blog post about this here:

Here are the highlights:
• Dell C1100 "cloud series" servers with 10x 2.5 inch drive bays
• OCZ Technology Vertex 2 MLC SSD's with the Sandforce 1200 series
• Arista Networks 7048 1U Top of Rack switches running MLAG with LACP to the
Let me know if you have any questions!


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