For Homedir migration in NAS migration scenario, which of the following description is wrong?

Which of the following schemes is usually used for file system level migration?

In the OceanStor 9000 system, when a service hard disk fails, which data recovery method will the system start?

Divide a LUN by 9000, map it to the operating system and mount a dedicated file system, and use the test tool to write a large number of 13K files. In order to improve the IO performance, it is recommended to set the read size to 16K.

OceanStor 9000 is a single file system. Snapshots can use all the space of the whole system.
There is no restriction on the use of snapshot space. Users cannot set the usage threshold of snapshot space.