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单项选择题A customer has a file server using RAID-5 with 8KB sequential write operations. How should the disk controller cache be configured for optimal performance and data integrity？（）

A.Use write-back cache with battery backup enabled
B.Use write-through cache with battery backup enabled
C.Use read-back cache with battery backup enabled
D.Use read-through cache with battery backup enabled

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1.单项选择题A customer needs to install a database on a server. Which of the following statements describes how to modify the RAID configuration for optimal performance？（）

A.Place both the database and transaction log on two logical drives in one RAID-10 array
B.Place both the database and transaction log on two logical drives in one RAID-1E array
C.Place the database on a RAID-1E array and place the transaction log on a separate RAID-5 array
D.Place the database on a RAID-5 array and place the transaction log on a separate RAID-1E array

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2.单项选择题A customer is experiencing a performance bottleneck. The server is performing sequential I/O requests with large block sizes of 64KB. Improving which of the following storage subsystem characteristics has the biggest impact on this bottleneck？（）

A.Seek Time
B.Drive RPM
C.Data Transfer Rate
D.Rotational Latency

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3.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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4.单项选择题A customer wants to create backups at a remotely located datacenter. Price and performance are of primary importance， so backup to disks at the remote location is selected instead of tape. The remote location is 1 KM （0.6 Miles） away from the data center. NAS is the solution being considered. Which of the following is the benefit of this solution？（）

A.NAS runs on 2Gb fibre， which will provide better performance.
B.NAS uses WAN infrastructure， which can easily span the 1 KM gap.
C.NAS requires fibre storage， which allows dual paths for redundancy.
D.NAS requires iSCSI routers and offers better growth environment.

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5.单项选择题Attaching to a SCSI storage system through redundant paths will provide which of the following？（）

A.The ability to interleave writes to the array
B.High Availability and failover
C.LUN sharing via Target Mode SCSI on the storage system
D.A greater number of LUNS available on the same storage system

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6.单项选择题A company installed a new server to manage its electronic image storage. They have two distinct image sizes： 2KB and 16KB. Two distinct arrays are created on a ServeRAID adapter. The first array will store all of the 2KB images， and the second array will store all the 16KB images. The RAID stripe size was left at the default size of 8KB. After installation， a performance problem is identified. According to performance monitoring， 80% of the images are 16KB. Which of the following will best optimize performance？（）

A.Change the stripe size on the RAID controller
B.Change the stripe size to 1024K on the RAID controller
C.Change the stripe size on the RAID controller for the first array
D.Change the stripe size on the RAID controller for the second array

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7.单项选择题A customer has the need to implement a tape backup solution to backup a 500GB database on a daily basis. Which of the following factors is the most important consideration in the design of a backup and restore solution？（）

A.Amount of data in the backup
B.Bandwidth available to the tape device
C.Length of the backup/restore window
D.Speed that the backup system can find files for restoration

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8.单项选择题 A customer wants to hold all enterprise data on their DS4000 system. Several servers were added after they purchased another company. The servers that have to be run are：
（1）An Oracle database running on a HP-UX server
（2）Several virtual machines running on VMWare ESX server
（3）A Microsoft cluster running Exchange 2000 server
Which of these new servers can be integrated with the DS4000？（）

A.DS4000 storage does not support HP-UX， so the HP-UX server cannot be integrated.All other new servers can be used.
B.An Exchange cluster needs local disks， so the DS4000 cannot be used for this.All other new servers can be used.
C.When equipped with proper HBA’s and subsystem device drivers， all new servers can operate with the DS4000 storage device.
D.VMWare ESX can use the DS4000 storage； however， the virtual machines running in it will not have access to this storage other than via a virtual disk.All other new servers can be used.

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9.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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10.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

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