You install one PSC for each additional site in your MSMQ network. The PEC functions as the site controller for the initial site you create. The PSC holds information about the computers and queues in the site in a database, and also functions as an MSMQ routing server. Although you do not have to install a PSC in each site (as defined in a preceding section, "MSMQ Sites"), it is highly recommended that you do.
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When you use MSMQ in a site without a PSC (or any other MSMQ server), you lose many of the benefits of MSMQ, including the efficient and persistent routing of messages. When the site is disconnected from the PEC site, independent clients within the site cannot locate queues or create queues, and each client uses additional resources as it attempts to resend undeliverable messages. MSMQ dependent clients can be used within the site only when the site controller is online. |