大型软件系统设计与体系结构Chapter12

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一. 单选题（共9题，45分）

1. (单选题, 5分)

____can be responsible for creating and hosting multiple virtual servers. 

A.VIM 

B.Hypervisors 

C.data center

D.cloud provider

2. (单选题, 5分)

____are system-level message exchanged between hypervisors, hypervisors and virtual servers, and hypervisors and VIMs.

A.Demands

B.Cloud services 

C.Heartbeats  

D.Signals

3. (单选题, 5分)

Dynamically calculates virtual server instances and associated workloads, before distributing the processing across available physical server hosts, it is____ .

A.Hypervisor Clustering Architecture   

B.Load Balanced Virtual Server Instances Architecture     

C.Non-Disruptive Service Relocation Architecture   

D.Zero Downtime Architecture

4. (单选题, 5分)

To avoid the resource constraint and resource borrowing conditions,____is used.

A.Resource Reservation Architecture   

B.Zero Downtime Architecture

C.Dynamic Failure Detection and Recovery Architecture      

D.Bare-Metal Provisioning Architecture  

5. (单选题, 5分)

Cloud-based environments can be comprised of vast quantities of IT resources, manually administering and solving IT resource failures is generally inefficient and impractical____can be established.

A。Zero Downtime Architecture  

B.Dynamic Failure Detection and Recovery Architecture

C.Bare-Metal Provisioning Architecture   

D.resource reservation architecture    

6. (单选题, 5分)

Bare-metal servers are ____that do not have pre-installed operating systems or any other software.      

A.physical servers  

B.physical servers  & virtual servers 

C.virtual servers    

D.VIM

7. (单选题, 5分)

The storage workload management architecture enables ____ to be evenly distributed across available cloud storage devices.

A.workloads

B. storage  

C.load balancers 

D.LUNs

8. (单选题, 5分)

____establishes a sophisticated failover system that allows virtual servers to be dynamically moved to different physical server hosts, in the event that their original physical server host fails.

A.Zero Downtime Architecture 

B.Dynamic Failure Detection and Recovery Architecture

C.Non-Disruptive Service Relocation Architecture   

D.Resource Reservation Architecture  

9. (单选题, 5分)

The hypervisor cluster is controlled via ____ .

A.central hypervisor 

B. data center

C. heartbeats  

D.central VIM

二. 判断题（共5题，25分）

10. (判断题, 5分)

 In IT resource reservation architecture protects cloud consumers from each other by avoiding the resource constraint and rescource borrowing conditions.

A.对

B.错

11. (判断题, 5分)

In hypervisor clustering architecture, if a given hypervisor becomes unavailable, the hosted virtual server can’t maintain runtime operations. 

A.对

B.错

12. (判断题, 5分)

Live VM migration is a system that is capable of relocating virtual servers or virtual server instances at runtime.

A.对

B.错

13. (判断题, 5分)

In non-disruptive service relocation architecture, the new cloud service implementation is guaranteed to be successfully receiving and responding to cloud service consumer requests after the original cloud service implementation is deactivated or removed.

A.对

B.错

14. (判断题, 5分)

Bare-metal servers are virtual servers that do not have pre-installed operating systems or any other software. 

A.对

B.错

三. 论述题（共1题，30分）

15. (论述题, 30分)

The hypervisor clustering architecture establishes a high-availability cluster of hypervisors across multiple physical servers. Please answer the questions:
（1）Fill in the IT resources of symbols (1) - (5).

（2）How to detect physical server failure？

（3）If a physical server becomes unavailable, how does this architecture solve？dac\

参考：（1）physical serve   hypersivor   virtual serve  storage   VIM

（2）The other physical servers and the VIM stop receiving heartbeat messages from the failed Physical Server.

（3）The VIM chooses a Physical Server as the new host to take ownership of Virtual Server after assessing the available capacity of other hypervisors in the cluster. VIM to initiate the live VM migration program, move the affected virtual server to a new host. Restarting may be necessary before normal operations of virtual server can be resumed.

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