Which one of the following descriptions about the physical division of Oceanstor 9000 is wrong?

Physical zone division is an effective means to isolate faults

The failure of some nodes will cause a physical separation with these nodes.

The reliability level of data on other nodes in the domain is reduced

Oceanstor 9000 achieves physical domain division through node pools and hierarchical methods

The administrator must add at least 2 storage nodes to a sub-domain