Nova is a virtual server deployment and service computing module developed by NASA. Which of the following statements about common terms in components is incorrect?

A. Flavor refers to the configuration template created for the VM instance

B. Security group rules are used to define remote access permissions for users

C. keypair refers to the key pair used when a user remotely connects to an instance through SSH

D. A security group is a group that assigns instances to start and stop operations

Which of the following storage device are used to store data?

A. Tape

B. Hard disk

C. CD-ROM

D. Floppy disk

In the cloud data center migration scenario, which of the following statements about configuring eDevLUNs for heterogeneous virtualization is correct?

A. The read/write policy of eDevLUNs "write-back" applies to random access services, ensuring that data in the cache is cached as long as possible to improve the read hit ratio.

B. The default read/write policy of eDevLUNs is applicable to common services to balance the hit ratio and disk access performance.

C. The read/write policy "Pairing" of eDevLUNs applies to sequential access services to release cache resources for other services as soon as possible.

D. When the eDevLUN reads data, it reads the data to be read from the hard disk in advance based on the specified policy.

After the recovery policy of Huawei DR software BCManager-eReplication is deployed, you must perform the test until the test is passed. In this case, failover or planned migration can be implemented.

A. True

B. False

In the data center active-active solution, the static priority mode or third-party arbitration mode can be used. However, if the arbitration fails, you need to manually switch to the static priority mode.

A. True

B. False