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From John Anderstedt <>
Subject Re: Cassandra Performance Testing
Date Fri, 24 Jan 2014 14:07:53 GMT
It sounds to me that the limitation in this setup is the disks.
if it’s in a mirror the cost for write’s is the dubble.

If you have the flatfile and the db on the same disk there will be a lot of io wait.

There is also a question of diskspace and fragmentation, if the flat file occupies 1,2TB of
a total of 2TB and then add the db to that. It will fill up and on the way it would go slower
by the hour because the background processes that runs the compaction needs space to run.

make sense?

mvh / regards

24 jan 2014 kl. 13:46 skrev Devin Pinkston <<>>:


I am using a single node Cassandra setup with version 2.0.4 to do some simple performance
testing.  I generated a 1.2TB flat file from DBGEN (TPC-H), and I am loading that into Cassandra.
 I used the “COPY FROM” method from the CQLSH.

My question/problem, the import has been running for over two days!  Is there something I
am potentially doing wrong?  I setup the single node Cassandra from the getting started page.

Specs for the server being used, (Ubuntu LTS x64)



Dell PowerEdge 1950 Server II



2x Intel Quad Core 2.33GHz E5345 8MB

Memory Installed


32GB PC2-5300F Fully Buffered Memory

Memory Size


Eight Slots Available: 8 x 4GB Memory Sticks

Hard Drives


2x 1TB 7.2K  SATA Hard Drives


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