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From Soerian Lieve <>
Subject Unbalanced disk load
Date Fri, 17 Jul 2015 21:08:26 GMT

I am currently benchmarking Cassandra with three machines, and on each
machine I am seeing an unbalanced distribution of data among the data
directories (1 per disk).
I am concerned that this affects my write performance, is there anything
that I can make the distribution be more even? Would raid0 be my best

3 machines, each have 24 cores, 64GB of RAM, 7 SSDs of 500GB each.
Commitlog is on a separate disk, cassandra.yaml configured according to
Datastax' guide on cassandra.yaml.
Total size of data is about 2TB, 14B records, all unique. Replication
factor of 1.


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