SLM and Vswap are disabled for a Virtuozzo node.
SLM is disabled on the node itself.
Enable SLM by changing "SLM=no" to "SLM=yes" in
/etc/sysconfig/vz on the node in question.
Restart the vz service for the changes to come into force. All containers on the node will be restarted.
# service vz restart