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• Xms1024m -Xmx1024m -XX:MaxPermSize=512m
• Change the /etc/security/limits.conf
  
  • soft nofile 4096
  • hard nofile 65535

• Recommended OS: Linux
• At least 10 GB storage capacity in each node
• At least 100 Mbps network bandwidth
• Set hadoop.root.logger=ERROR

• Have separate disks for your commit log and data dirs (sstables)

• Set the Heap memory as follows:

  System memory	Heap size
  Less than 2 GB	1/2 of system memory
  2-4 GB	1 GB
  More than 4 GB	1/4 system memory, but not more than 8GB

• Set following configuration in cassandra.yaml according to your hardware resources:

  • concurrent_reads: 4 * no of cores
  • concurrent_writes: 8 * no of CPU cores

Also see http://www.datastax.com/docs/1.0/operations/tuning in Cassandra documentation.