Since version 2.0 you can use the Cassandra distributed database as an alternative to the in memory database.
Install cassandra from the package manager of your distribution.
on debian, install cassandra
Alternatively you can use a proper puppet module.
The snooze node config file (snooze_node.cfg) contains a section dealing with the configuration of the cassandra
#coma separated list of cassandra hosts
database.cassandra.hosts = <address:port>
# Maximum number of monitoring entries to keep per group manager
database.numberOfEntriesPerGroupManager = 20
# Maximum number of monitoring entries to keep per virtual machine
database.numberOfEntriesPerVirtualMachine = 30
Note that when using Cassandra database.numberOfEntriesPerGroupManager and database.numberOfEntriesPerVirtualMachine correspond to the number of seconds the monitoring values will be stored. It uses the TTL feature of the cassandra columns.