http://www.petri.co.il/defragment_exchange_2000_2003_server_databases.ht m Offline defragmentation creates a new database by copying all records and tables from the old database into the new database. Because this is a copy, defragmentation requires free disk space equal to the size of the database (actually, you'll need 110% of free space). Microsoft recommends a conservative 5 - 7 GB per hour for a defrag operation, which means that your server will be offline for as long as it takes, assuming no hardware failures will occur. Thanks Larry Larry Fry Sr. Systems Administrator, MarkMonitor 391 N. Ancestor Pl. Suite 100 Boise, ID 83704 Direct: +1.208-389-5778 Cell: +1.208.794.5223 Larry.fry@xxxxxxxxxxxxxxx www.markmonitor.com <http://www.markmonitor.com/> ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Danny Sent: Thursday, November 15, 2007 10:10 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Exchange offline defrag timeframe Any idea how long and how much disk space I will need to offline defrag the following platform? Server: Xeon 3.6Ghz, 4GB RAM, RAID 5 on 4 15K RPM SAS drives Exchange Server 2003 SP2 Primary Storage Group = 90GB Secondary Storage Group = 15GB Thanks. ---