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# View SRDF Topology view, SRDF Pair Topology view, and Migration Environments view

The SRDF Topology view visually describes the layout of the SRDF connectivity of the selected storage system. The Migrations Environments topology view visually describes the layout of the migration environments of the selected storage system.

## About this task

The SRDF Topology view, SRDF Pair Topology view, and the Migration Environments view are available from the Protection dashboard (see View Protection dashboard).

The SRDF Topology view visually describes the layout of the SRDF connectivity of the selected storage system.

It calculates the connectivity with a maximum of two hops. For example, storage system A has SRDF Groups to storage system B, which has SRDF Groups to storage system C. If a fourth storage system, storage system D, has SRDF Groups to storage system C but is not connected to storage system A or storage system B, it is not shown. The reason that it is not shown is because it is outside the two hop count for the storage system that Unisphere is managing. All types of SRDF Groups are used to calculate this view.

There are two components which make up the topology view, nodes and edges. A node is the storage system, and the edges are the connectivity between the storage systems.

The edges are color-coded in the familiar traffic light system. The colors are Green, Yellow, and Red.

Green edges indicate that the state of the connectivity between two nodes (storage systems) is Good.

Yellow indicates that the connectivity between two nodes is degraded. Degraded in this case means that one or more SRDF Groups between the two storage systems are either in a Transmit Idle state, or have some ports in an SRDF Group that are offline.

Red indicates that the state of the connectivity between two nodes is Critical. Critical in this case means that one or more SRDF Groups between the two storage systems are Offline, or one or more SRDF Groups contains ports that are all offline.

The edges are also drawn differently depending on the modes of the SRDF Groups between two storage systems. A legend is available under the view:

Edges that are drawn with short dashes and short gapes between the dashes indicate that all the SRDF Groups between the two storage systems are Metro or Synchronous SRDF Groups.

Edges that are drawn with longer dashes and a short gap between the dashes indicate that all the SRDF Groups between the two storage systems are Asynchronous.

Edges that are solid indicate that there are Asynchronous, Synchronous, and SRDF/Metro SRDF Groups between the two storage systems.

Edges that are drawn with short dashes and a long distance between the dashes indicate that the SRDF Groups between the two storage systems are other SRDF Groups than mentioned above, including Empty SRDF Groups, Virtual Witness, Adaptive Copy, and so on.

The nodes are drawn with some basic information about the storage system, including storage system ID and if set, the user-defined name of the storage system. An icon specific to the model of the storage system is also drawn into the node.

The SRDF Pair Topology view displays the SRDF pair states. Tooltips display information about the pairs. The following colors indicate the status of each pair:

- Green: Synchronized, Synchronization in Progress, Consistent
- Yellow: Suspended, Split, Failed Over, R1 Updated, R1 Update in Progress, Invalid
- Red: Partitioned, Transmit Idle

The Migrations Environments topology view visually describes the layout of the migration environments of the selected storage system.

The edges are color-coded using the familiar traffic light system Red, Yellow, and Green, Red in this case meaning the Migration Environment is in an Invalid State and Green meaning it is in a valid state. The color of the edge can also be dictated by the worst state of any migrations using this Environment. The edges are all drawn in a solid full line.

The nodes are drawn with some basic information about the storage system, including ID and if set, the user-defined nice name of the storage system. An icon specific to the model of the storage system is drawn into the node.

Both topology views have the following controls:

- - allows you to view a full screen view of the topology. Clicking this icon opens a message window that takes up most of the visible space on the screen. All functionality of this view is the same as the view embedded on the page.
- displays a Layout Manager which provides layout change options.