I currently have Exchange 2007 with 3 database drives and 1 transaction log drive.  All are on a NetApp FAS3240 and I am using SnapManager for Exchange for transaction log backup.  I am upgrading to Exchange 2013 and I have read that some recommend having a log drive per database (3 database drives and 3 log drives).  Recommendations?

Are you building just one server or will you have a DAG?

Your question doesn't have a straightforward yes or no answer.  I recommend you use the Exchange 2013 Server Role Requirements Calculator and enter your own requirements.

https://gallery.technet.microsoft.com/office/Exchange-2013-Server-Role-f8a61780

Hi,

The transaction log files are a record of every transaction performed by the database engine.

Please use the following table to estimate the number of transaction logs that are generated on an Exchange 2010 Mailbox serve.

https://technet.microsoft.com/en-us/library/ee832796(v=exchg.141).aspx#size

I suggest you can have a look at the below article for better Exchange performance.

http://blogs.technet.com/b/exchange/archive/2011/11/09/capacity-planning-yes-transaction-log-space-is-critical-to-keeping-your-databases-healthy-and-mounted.aspx

Regards,

David