Concepts of the anti-affinity ECS group and SCSI reservations:
For details about ECS groups, see Managing ECS Groups in the Elastic Cloud Server User Guide.
A common EVS disk can only be attached to one server, whereas a shared EVS disk can be attached to up to 16 servers.
For details about how to attach a shared EVS disk, see Attaching a Shared Disk.
Because a shared EVS disk can be attached to multiple servers, ensure that the shared EVS disk is detached from all the servers before deletion.
For details about how to detach a shared EVS disk, see Deleting an EVS Disk.
Shared EVS disks must be expanded when they are in the Available state. For details, see Expanding an Available EVS Disk.