When planning an active-active disaster recovery solution, the business side needs to use cluster applications. Which of the following cluster applications can support the AA working mode?

A company has various businesses such as email and online storage, but its storage space is limited. It plans to enable SmartThin technology to optimize storage space. Which of the following statements are true about SmartThin? (Multiple Choice)

Storage engineer A often receives feedback from users that the read and write speed of business applications running on the storage is slow, and there is a phenomenon of lag. Engineer A logs in to the storage to check and finds that there is no front-end service port alarm, and replies to the user that the storage performance is normal.

A company plans to migrate the business data of data center A to the storage of data center B due to business development needs. Engineer M is responsible for the relevant migration work.
The engineer first collects equipment and other information, then evaluates the business impact and risks, and formulates a detailed migration project plan for this, and submits it to the supervisor for review. The current migration work of engineer M is in the evaluation and investigation stage of data migration.

When engineer A implements storage delivery, the Linux service host cannot scan the LUN.
Which of the following descriptions are possible reasons? (Multiple Choice)