Users can make an API call to expand the EVS disks in one or multiple EVS replication pairs of a replication consistency group. In such an expansion operation, two EVS disks in one EVS replication pair are expanded together.
The status and replication_status values of the replication consistency group remain unchanged before and after capacity expansion.
If the expansion fails, contact customer service to locate and rectify the fault. After the fault is rectified, expand the disks again.
For details, see Expanding EVS Disks a Replication Consistency Group in the Elastic Volume Service API Reference.