SQL Server 2000 I/O Configuration in a SAN/NAS Environment 
by Edward Whalen - Some of the most common SQL Server performance problems involve the I/O subsystem. Since SQL Server’s main function is to manipulate data, and that data resides either in memory or on the I/O subsystem, any I/O performance problems will result in SQL Server performance problems. Much of the design of the SQL Server RDBMS is intended to make accessing the I/O subsystem as efficient as possible.
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