How much bandwidth, RAM, disk space, and computing does the DCC require?
The UDP packets used by a DCC client to obtain the checksum totals from a DCC server for a mail message generally use less bandwidth than the DNS queries required to receive the same message. A DCC client needs very little disk space. Bulk messages are usually logged by DCC clients. On systems receiving a lot of mail, the mechanisms for automatically creating new log directories every minute, day, or hour can keep any single log directory from becoming too large. See the dccm and dccproc man pages. About 1.4 GBytes/day are exchanged between each pair of DCC servers. Each server has 3 or 4 peers. The resulting database is about 3 GBytes with the default expiration parameters.. However, while dbclean is deleting old checksums, there are three copies of the database. The DCC clients and server do not need many CPU cycles, but the daily executions of dbclean on a system with a DCC server require a computer with at least 2 or 3 GBytes of RAM. In 2006, a DCC server prefers more than 4 GBytes
