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IBM(000-077)

单项选择题

An xSeries specialist monitors a customer’s server that has poor performance.  The customer is running an x365 with a ServeRAID 6i controller with write-back cache turned on and ten 15K rpm drives in a RAID-5 array.  It is a mission-critical server and must have a redundant storage system.  Performance tests indicate that the Average Disk sec/Transfer exceeds 20 ms.  Which of the following is the lowest-cost method to increase the throughput？（）

A.Disable the ServRAID cache
B.Change the RAID level to 10
C.Change the cache level to Write Through
D.Add five more drives to the array to increase the number of read/write heads

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