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Exchange 2010 and storage systems
This article is part of the IT in Europe issue of October 2011
The latest version of Exchange Server has some significant changes that will impact the storage supporting the mail system. By Brien M. Posey With Exchange Server 2010, Microsoft Corp. made some major changes to the database structure that underlies the email application. These architectural changes have a significant impact on planning for Exchange Server's data storage requirements. The biggest change Microsoft made was eliminating single-instance storage (SIS). Previously, if a message was sent to multiple recipients, only one copy of the message was stored within the mailbox database. User mailboxes received pointers to the message rather than a copy of the entire message. The elimination of single-instance storage means that when a message is sent to multiple recipients, each recipient receives a full copy of the message. In terms of capacity planning, the overall impact of this change will vary depending on how many messages include attachments. Text and HTML-based messages are typically small and will have a minimal ...
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