Huawei explicitly states under Working Principle of the Mirroring Function of Volume Management Software:

''Add the target storage to a VG before the mirroring.'' ''Run the lvconvert command to mirror LVs.'' ''After the mirroring, remove the source storage and the data migration is complete.''

Therefore, the correct answer is B. lvconvert.

In an LVM-based migration, both the source and target physical volumes are made available within the appropriate volume group. lvconvert converts the existing logical-volume layout into a mirrored configuration so that LVM creates and synchronizes another copy of the logical volume on the target storage.

The HCIE Lab Guide also demonstrates lvconvert during the migration workflow. Once synchronization is complete, the mirror can later be split, allowing the target-side image to become the active migrated copy while the original source-side image can be preserved temporarily for rollback.

lvmigrate, hrmirror, and lvexport are not the command used by Huawei's documented Linux LVM migration workflow for creating the mirror.

Study Guide Topics: Data Migration Solution Host Volume Management Software Linux LVM Volume Mirroring lvconvert.