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zbnet -> RE: Sanity check my disk layouts... (16.Nov.2012 10:26:03 AM)
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These questions are dealt with on this technet page: http://technet.microsoft.com/en-us/library/ff622323.aspx
Pagefile should be RAM+10MB (for servers with >8GB of memory).
Historically, on Exchange servers, you separate the DB and the LOGs for the DB onto separate LUNS. I know Exchange 2010 has made huge strides forward in reducing the IOPS requirements of the storage used for hosting mail databases, but still, to break the rule by putting the DBs on the same LUN as the LOGS you need multiple copies of the data (ie a DAG), and you don't have that yet.
I know you'll argue and say that the performance of a multiple spindle RAID 1+0 array is good enough, but you're potentially compromising your recovery of Exchange if the total volume fails (as it will if you suffer from a simultaneous - or overlapping - two-disk failure). Separate your DB and its LOGS onto separate LUNS (ie separate RAIDed disk arrays) and you'd then need 4 simultaneous (or overlapping) disk failures to toast your server's data.
Why aren't your users using cached mode Outlook? This is the recommendation for Exchange 2010, I don't know why you'd not want to use it.
If your current server disk capacity isn't big enough to store all the mail for your users then you need bigger/more disks. archiving off some of the old mail to mimecast to me is defeating the purpose of having Exchange. Exchange 2010 has great support for big mailboxes, and also includes within the product you've bought the concept of archive mailboxes. Keep the mail within Exchange, much easier to support, and a less complex overall solution.
Finally, if you're planning on adding additional servers to make a DAG, don't forget that the database DB paths need to be identical across the DAG servers, so the storage decisions you make for this first server will dictate the setup of the other DAG servers (at least as far as DBs are concerned). If you only add a second server to the DAG, you still need both servers to run RAID for the DBs, JBOD is only a good idea for DBs when you have a minimum of 3 DB copies/DAG nodes.
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