E20-326 Question #217: Real Exam Question with Answer & Explanation

You are designing the Symmetrix VMAX architecture for a DAS-to-SAN SQL Server migration. Currently all user databases reside on a single, locally-attached disk enclosure, mounted to "N:". You have decided on RAID-5 protected 15,000 RPM drives for the new SQL database and RAID- 1 for the transaction log. Last week, you configured Perfmon to record the current IOPS load of the databases during the 8-hour business day, Monday through Friday as shown in the exhibit. During an average business day, the transaction log processes 87 GB worth of data. Following EMC best practices, how many IOPS should be subtracted from the overall write IOPS, when calculating for the database writes?