单项选择题

A customer is building a database server， and the server does sequential write most of the time. They are planning to use an IBM x445 and a ServeRAID-6M adapter. Which of the following fault tolerant RAID levels will perform best for sequential write？（）

A.RAID-5 with cache write back
B.RAID-1E with cache write back
C.RAID-10 with cache write thru
D.RAID-50 with cache write thru

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单项选择题

The statistics for a poorly performing， dual-processor x365 system are as follows：
（1）Processor： 80% for 5-second increments
（2）Memory page faults： 360/second average over 15 minutes
（3）Disk % disk time： 100%
Which of the following will provide the greatest performance improvement？（）

A.Add memory
B.Add a processor
C.Exchange the existing processor for a faster processor
D.Add a faster disk subsystem

单项选择题

Which of the following is the benefit of installing two expandability cables to an RXE-100 from an x445？（）

A.Higher availability of the enclosure
B.Access to both channels of the RXE-100
C.Support for more PCI-X 133MHz I/O cards
D.Improved management of the Drawer Management Controller in the RXE-100

单项选择题

An x445 with two 3.0GHz DP processors and 2GB of RAM is running a processor-intensive floating-point geological application that calculates pressures in the earth’s crust. It takes a long time for each calculation， and the director of computing wants the calculations to take less time. Memory addressed by the application may also be a bottle neck. Which of the following will most improve the ability to run the calculations in less time？（）

A.Replace the two 3.0 GHz DP processors with four 3.0GHz MP processors with a 4MB L3 cache and 4GB of RAM
B.Replace the x445 with an x366 with four 3.66 EM64T processors with a 1MB L2 cache and 4GB of RAM
C.Replace the two 3.0GHz DP processors with two 3.0GHz MP processors with a 4MB L3 cache and 2GB RAM
D.Replace the two 3.0GHz DP processors with four 3.0 GHz DP processors with a 512KB L2 cache and 4GB RAM