Data is replicated from the owner directly to the other sites using MSMQ messages and private queues. A PEC replicates the enterprise and its site-specific data directly to other PSCs. Each PSC replicates its site-specific settings directly to the PEC. This is called inter-site replication. Each PSC (and the PEC) replicates the information it owns and the information it receives from other PSCs to the BSC at its site. This is called intra-site replication. PSCs (including the PEC) never replicate information to BSCs in other sites.
For example, in Figure 1.9, the MQIS database on the PEC at site A contains the master database for enterprise, site, site link, and CN settings; the master database for site A computer and queue settings; and replicated data owned by sites B and C. The MQIS database on the PSC at Site B contains the master database for site B computer and queue settings; replicated computer and queue settings from sites C and A; and replicated site, site link, CN, and enterprise settings from the PEC. The MQIS database on the PSC at Site C contains the master database for site C computer and queue settings; replicated computer and queue settings from sites B and A; and replicated site, site link, CN, and enterprise settings from the PEC.
Figure 1.9
Because intra-site replication is quicker and cheaper than inter-site replication, it takes place more often. By default, intra-site replication occurs every 2 seconds, while inter-site replication occurs every 10 seconds. However, the database is immediately replicated whenever the site topology changes, such as when a site is added.
For information on how to change MSMQ replication intervals, see MSMQ Explorer Help.