Why is it that the SCSI RAID 1 that is mentioned is using 73gb drives, while the SATA that is mentioned is using 250GB drives?
The Western Digital 74gb Raptors are the, overall, fastest SATA drives I have used. I think they would be a better match/comparison to SCSI.
Yes, SCSI will ultimately be faster, but unless you have HUGE amounts of Exchange Server activity is it unlikely to make much difference in performance.
Currently I have three different Exchange/File Servers in place. ALL of my Exchange Servers are on Servers with 1gb of RAM and all of them use SATA as well. (Combinatios of Raptor 36gb and 74gb drives as necessary.)
If you need more space/performance, then go with Exchange Server v2003 and make additional storage pools and put the logs and data on separate drive pairs. (This can be done in Exchange v2000 as well, but I have only done it with Exchange v2003.)
I have NO, problem trusing my Servers to SATA and I have had no issues. (NOTE: I actively test, and verify RAID operation once a month. While there have been no failures, I find it reassuring to do so. Basically, and granted not necessarily comprehensibly, I just break a mirror pair or checksum group and insert a new drive to force a rebuild.)
I don't see why there should be nay issues. Our overal activity is, what I would consider moderate.
Each Server has about 100 users, and ab out 16gb of message storage space used. We also have anti-virus scanning installed on each sever as well.
Good Luck.