Configuring Basic Storage Services
Configuring basic storage services includes creation of a disk domain, storage pool, LUN, LUN group, host, and host group on each of the active-active storage systems.

It is recommended that you configure the same disk domain, storage pool, and LUNs on the local and remote storage systems.
For detailed configurations, see the Basic Storage Service Configuration Guide for Block corresponding to your product model.
https://support.huawei.com/enterprise/en/doc/EDOC1000084209/76b248ff/configuring-basic-storage-services