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The "CassandraHardware" page has been changed by JonathanEllis. The comment on this change is: link eonnen's EBS explanation. http://wiki.apache.org/cassandra/CassandraHardware?action=diff&rev1=17&rev2=18 -------------------------------------------------- === Cloud === Several heavy users of Cassandra deploy in the cloud, e.g. CloudKick on Rackspace Cloud Servers and SimpleGeo on Amazon EC2. - On EC2, the best practice is to use L or XL instances with local storage. I/o performance is proportionately much worse on S and M sizes, and EBS essentially doubles your dependence on the already-overcrowded EC2 network (https://www.cloudkick.com/blog/2010/jan/12/visual-ec2-latency/), so you want to avoid that. Put the Cassandra commitlog on the root volume, and the data directory on the raid0'd ephemeral disks. + On EC2, the best practice is to use L or XL instances with local storage. I/o performance is proportionately much worse on S and M sizes, and EBS is a bad fit for several reasons (see [[http://www.mail-archive.com/user@cassandra.apache.org/msg11022.html|Erik Onnen's excellent explanation]]). Put the Cassandra commitlog on the root volume, and the data directory on the raid0'd ephemeral disks.
