All to often articles and presentations about storage work under the assumption that you have a typical OLTP database with mostly reads. However there are plenty of databases out there which are mostly writes and very few reads. Setting these systems up takes a different technique for best performance.
In my just released article on SearchSQLServer.com called “How to configure storage in SQL Server DB with more writes than reads” I go over some of the differences between a normal OLTP database and a high write OLTP database.
Denny