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To change the caching strategy used by the KVM hypervisor:

  1. Edit /etc/extility/nodeconfig/nodetemplate.xml.
     
  2. Add the following line:

    <node>
    	<hypervisor_data>
    		<cache>[value]</cache>
    	</hypervisor_data>
    ........
    </node>
  3. Possible values for cache are as follows: 

    Not all values for cache are supported by all storage modes. Ensure you know which values are supported before changing this value.

    • none
    • writeback
    • unsafe
    • directsync
    • writethrough
       

  4. For more details on the KVM caching capability, type man kvm on a linux machine and search for cache.
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