Two DS8700 systems have been proposed for a disk-to-disk BC solution. Each system has 200 TB installed， with a data change rate of 18% per day. Two 2 Gbps CWDM links are in place between the remote data centers with an average utilization rate of 55%. The proposed solution  
includes additional CWDM ports. 
Which of the following should justify the additional CWDM ports（）

单项选择题WhichofthefollowingstatementsaboutDS8000harddrivetechnologyiscorrect（）

A.All types of the 2.5" disk drives offered by the DS8800 system have higher performance than the 3.5" disk drives supported by DS8700
B.The 2.5" disk drives included on the DS8800 support 6Gbps SAS； the 3.5" disk drives in DS8700 are 4 Gbps FC
C.The 2.5" disk drives included on the DS8800 support 8Gbps SAS； the 3.5" disk drives in DS8700 are 4 Gbps FC
D.The 2.5" 15k rpm drives offered by the DS8800 system support 6Gbps SAS-2

单项选择题WhichIBMhost-baseddevicedriverallowsforpathfailover，whilealsoprovidingdynamicloadbalancingonaWindows2000-basedserver（）

A.PowerPath
B.MPIO
C.RDAC
D.SDD

单项选择题A global customer’s IT strategy is based upon two DS8000 systems and an N series gateway. They want to protect their  business by implementing a disaster recovery solution. The storage specialist has recommended cascaded mirroring.  Which of the following is the business benefit of cascaded replication（）

A.it is cost efficient， as a single N series or DS8000 can have its controllers split between the  primary and secondary site and use semi- synchronousmirroring while using asynchronous mirroring to a third site
B.the second site acts as a repeater station so that greater geographical distances can be achieved
C.ITprovides high availability together with disaster recovery by implementing Metro/Global Mirror across three geographically dispersed systems
D.it guarantees data protection by implementing two synchronous copies of the primary site data

单项选择题A company has a 30 TB multi-vendor storage environment attached to System i and open systems. They are concerned about the time and effort caused by frequent migrations to new storage hardware for open systems data. In addition to consolidating their storage to a single platform， they would like to take advantage of advanced features such as Easy Tier and implement a three-site business continuity strategy.  Which product provides the best long-term solution for this company（）

A.IBM System Storage DS8000
B.IBM XIV Storage System
C.IBM System Storage N series
D.IBMStorwize V7000

单项选择题A customer wants to purchase an IBM System Storage DS8700 to support a high-performance database environment.  Which technical solution gives the customer the best relationship between I O performance at the machine’s backend vs. capacity installed in the machine（）

A.additional installation of the first and second expansion frame will increase the backend performance capability
B.the usage of 300 GB/15k FC disks will give the server a high-performance backend capability
C.performance Accelerator restricts the number of disks connected to one device adapter pair to 32 disks
D.the second RIO-G loop between the base frame and the first expansion increases the backend performance