Spindle requirements for SBS2011

I'm prepping a system and am interested in the Spindle requirements for SBS2011.  I remember back when Exchange 2007 came out, they wanted 3 spindles (data, logs, transactions (I think)).  Is that requirement still there?  Or does Microsoft just want an OS partition and all the other stuff on one data partition?

I have the capabilities for 3 spindles (RAID1 OS, RAID 5 Data, and RAID 5 data).  Or to combine the two DATA for one large RAID 5?

Thanks in advance.
creativenetworksAsked:
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PakaConnect With a Mentor Commented:
Probably a better benchmark would be IO per Second (IOPS).  Here's a pretty good discussion on this topic:
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/SBS_Small_Business_Server/Q_27248242.html

How many users are you supporting?  What is the main application (Exchange...)?  How are you backing up the data?

Depending on the answers above, you'd probably be OK with a couple different LUN configurations:

Small number of users low IOPS requirement - keep them all on a RAID5 or better (using the keep it simple approach)

Medium number of users medium IOPS requirement - OS on RAID1; Logs on RAID1; data on RAID5).

Large number of users large IOPS requirement - OS on RAID1; app logs on separate RAID1s; app data on separate RAID5s.
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creativenetworksAuthor Commented:
The option I have chosen is the Program will install on a RAID 1 OS partition, the information stores and Logs will go on a rather large RAID5 (15 users, 2.7tb RAID5).  We will be using Backup Exec as our BU solution and run daily brick level backups
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