In Exchange 2003 on a mailbox server with the DB on a no Raid or Raid 0 disk drive how much disk I/O is created to receive andsend a message?

Hi Joseph,Its really tough to say how much IOPS for a particular MBX. Basically there are lot of factors which will decide this.Check this out http://technet.microsoft.com/en-us/library/bb125019(EXCHG.65).aspxLook at this theortical data. But even this will change once the user starts doing a search etc. User Type Database Volume IOPS Send/Receive per day Mailbox Size Light .5 20 sent/50 received 50MB Average .75 30 sent/75 received 100MB Heavy 1.0 40 sent/100 received 200MB Large 1.5 60 sent/150 received 500 MB Raj

Do not forget about mobile devices. ActiveSync is about .75 IOPS per device. Blackberry is estimated to be at 3.75 IOPS. Now Blackberry dispute that the number is this high but take it with a grain of salt. Finally those numbers are assuming you are in Cached mode. If you are not, add another factor of 1.5 onto it. http://technet.microsoft.com/en-us/library/bb738147%28EXCHG.80%29.aspx Mark Morowczynski|MCT| MCSE 2003:Messaging, Security|MCITP:ES, SA,EA|MCTS:Windows Mobile Admin|Security+|http://almostdailytech.com

Thanks for the responses they were great but is there a similar article for Exchange 2003 that is as granular as the one for 2007?

Hi,For exchange 2007, Mailbox Server Storage Designhttp://technet.microsoft.com/en-us/library/bb738147(EXCHG.80).aspxFrank Wang