A company purchased a Huawei hybrid flash system. The current service information is as follows:
1. Online transaction service: random write I/Os account for 80%.
2. Online query service: sequential reading I/Os account for 90%.
3. Configured with SSD, SAS disk and NL-SAS disk.
Which of the following plans for storage engineers to plan storage services is unreasonable?

A company has deployed a set of old storage for data. Due to business upgrades, a new set of Huawei all-flash storage is purchased to replace the old storage. The front-end business runs on the host cluster system. If the takeover method is adopted, which of the following is correct?
(Multiple Choice)

As a common troubleshooting method, the ( ) method is to use a normal working component to replace a suspected abnormal working component, so as to achieve the purpose of locating the fault and eliminating the fault.

Which of the extended statements about storage is true? (Multiple Choice)

A company has an existing set of third-party storage devices and plans to migrate data. The target storage is Huawei all-flash storage. During the migration, it is found that the third-party storage is accidentally powered off, causing service interruption. At this time, data migration rollback is performed to restore the service.