I am running a EMS command to get the size of all of my mailboxdatabases. I run the command last week as well as this week. The majority of the databases are the same exact size. This looks strange so I decided to post it. Information: Exchange 2010 SP1, Windows 2008R2, One DAG setup across 4 HubMail servers. I will be upgrading the Exchange servers to 2010 SP1 RU2 soon.

Exchange will re-use database whitespace before it grows on disk. That said, viewing file sizes on open databases isnt always an accurate way to judge file size changes.

This is beauty of Exchange which do self housekeeping and remove old/unwanted and whitespace from DB. You should read about exchnage 2010 Databse behaviour in detail. Exchange 2010 24×7 Online Defragmentation and Online Database Scanning http://www.shudnow.net/2009/10/25/exchange-2010-24x7-online-defragmentation-and-online-database-scanning/ Anil MCC 2011,ITIL V3,MCSA 2003,MCTS 2011, My Blog : http://messagingschool.wordpress.com

Yes, agree with Andy and Anil. The database itself will always have free pages, or white space, spread throughout. During background database maintenance, items marked for removal from the database are removed, which frees these pages. The percentage of white space is constantly changing due to the efforts of the 24x7 online defragmentation process. You can know more information about Exchange 2010 mailbox database from this document: Understanding Mailbox Database and Log Capacity Factors http://technet.microsoft.com/en-us/library/ee832796.aspx Thanks, Evan Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.