6.9. Tornado Back End Configuration

Tornado Back End configuration is quite simple, all that needs to be done is the creation of a cascade feed object (in feeds.conf) of the following format:


<cascadefeed>
   OutgoingHostName     outgoing_hostname
   OutgoingFeedName     cascade_name
   Port                 119
</cascadefeed>

Modifications in stormcellar.conf:


   NumberOfStreams      16
   CascadeDepthPercent  1

OutgoingHostName

The name/IP of the stormcellar

OutgoingFeedName

For reporting stats, this name will be used

Port

Optional the port number to connect to on the StormCellar

NumberOfStreams

How many streams to feed to the backend. This number depends on the size of the feed coming in, as a rule of thumb, one stream per 5megabit/sec, minimum 3.

CascadeDepthPercent

The percentage of the backend retention that will overlap the stormcellar. 1% should be sufficient for most installations. Increasing this will cause more of a backlog to be retained by the backend, allowing for more of a buffer for StormCellar downtime.