Hello all,We are attempting to finalize our disk architecture for an Exchange 2007 environment with approximately 3200 users, about 1800 of which have Blackberry devices and are moderate to very heavy users of both Exchange and Blackberries.I've done my homework on IOPS specific to Blackberry and almost all of the available documentation that I've been able to access has numbers for Exchange 2003 (including RIM's performance guides), but not much of anything for Exchange 2007, in which IOPS requirements dwindle significantly from a general Exchange 2003 versus Exchange 2007 perspective.I've seen many posts and articles refer to the number 3.64 for additional IOPS, and many articles state that a heavy BB user adds 3-4 times the IOPS requirements to calculations (including RIM's performance guides). My question is this, where is the 3.64 number generated from. How is 3.64 calculated? Is it calculated as a static 3.64 additional IOPS per Blackberry Exchange user, or is it in fact a multiplier number to be used based upon some type of baseline number of IOPS? Here's an example:1.0 IOPS per user for Exchange 2003 heavy user profile1.0 x 2000 users = 2000 IOPS baseline500 mailboxes x 3.64 = 1820 IOPS additional for BB users3820 IOPS totalThis comes from the following blog:MsExchange Blog Spot Telnet25.org: BlackBerry cause additional overhead on exchange serverI am confused as to how and where exactly the 3.64 number is derived from. Is it derived from 1.0 IOPS baseline per user multiplied by 3.64 = 3.64 additional IOPS per Blackberry user? If so, then if I change the baseline IOPS number to 0.48 baseline per user, does the 3.64 additional IOPS per Blackberry user still apply as a static number, or do I have to recalculate the additional IOPS based upon the multiplier and the baseline IOPS number? For instance:0.48 IOPS per user for Exchange 2007 very heavy user profile0.48 x 3.64 = 1.74 additional IOPS per Blackberry user0.48 x 2000 users = 960 IOPS baseline500 mailboxes x 1.74 = 870 IOPS additional for BB usersOr is it still 500 mailboxes x 3.64 = 1820 IOPS additional for BB usersI really need to nail down the IOPS calculation by the end of this week if at all possible, hence this post. Much thanks in advance to anyone who may be able to lend their experience!

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/8067/645045/7963/7965/1180408/Performance_Benchmarking_Guide.pdf?nodeid=1367404&vernum=0 this link read it completely to understand the baseline test performed by Blackberry with Exchange 2003. This same applies for Exchange 2007 . Page 60 should help you further.