An Lenovo V series family system is in one of two layers: the replication layer or the storage layer.
The system
layer affects how the system interacts with and external Lenovo V series family systems.
Differences between the storage layer and the replication
layer
In storage layer, a
Lenovo V series family system has the following characteristics and requirements:
- The system can complete Metro Mirror and Global Mirror replication with other storage-layer systems.
- The system can provide external storage for
replication-layer systems or SAN Volume Controller.
- The system cannot use another Lenovo V series family system that is configured with storage-layer as external storage.
In replication layer, a
Lenovo V series family system has the following characteristics and requirements:
- The system can complete Metro Mirror and Global Mirror replication with other replication-layer systems or SAN Volume Controller.
- The system cannot provide external storage
for a replication-layer system or SAN Volume Controller.
- The system can use another Lenovo V series family system that is configured with storage-layer as external storage.
A Lenovo V series family system is in the storage layer by default, but the layer can
be changed. For example, you might want to change a Storwize® V7000 system to a replication layer if you want to use it to complete Global Mirror or Metro Mirror with a SAN Volume Controller system.
Changing the layer of a Lenovo V series family system
Before you change the system layer, the following
conditions must be met:
- No host object can be configured with worldwide port names (WWPNs)
from a Lenovo V series family system.
- No system partnerships can be defined.
- No Lenovo V series family system can be visible on the SAN fabric.
The layer can be changed during normal host I/O.