.. _cassandra_tuning:

========================
Cassandra Tuning
========================

The following is an OS tuning script provided by DataStax (created for use with CentOS 6):

  .. code-block:: none

   #!/usr/bin/env bash
 
   echo deadline > /sys/block/vda/queue/scheduler
   echo 0 > /proc/sys/vm/zone_reclaim_mode
 
 
   # readahead to 64
   blockdev --setra 64 /dev/vda1
 
   # swap off
   echo 0 > /proc/sys/vm/swappiness
   swapoff --all
 
   # user limits
   grep -q -F '* - nproc 32768' /etc/security/limits.d/90-nproc.conf || echo '* - nproc 32768' >> /etc/security/limits.d/90-nproc.conf
   grep -q -F 'vm.max_map_count = 131072' /etc/sysctl.conf || echo 'vm.max_map_count = 131072' >> /etc/sysctl.conf


.. toctree::
   :maxdepth: 1

   cassandra.yaml

   jvm

   cassandra_server_configuration