Determining the system IDs of the replacement controller modules

After you have replaced all hardware at the disaster site, you must determine the system ID of the newly installed storage controller module or modules.

About this task

You must perform this procedure with the replacement controller modules in Maintenance mode.
This section provides examples for two and four-node configurations. For two-node configurations, you can ignore references to the second node at each site. For eight-node configurations, you must account for the additional nodes on the second DR group. The examples make the following assumptions:
  • Site A is the disaster site.
  • node_A_1 has been replaced.
  • node_A_2 has been replaced.

    Present only in four-node MetroCluster configurations.

  • Site B is the surviving site.
  • node_B_1 is healthy.
  • node_B_2 is healthy.

    Present only in four-node MetroCluster configurations.

The examples in this procedure use controllers with the following system IDs:

Number of nodes in MetroCluster configuration Node Original system ID New system ID Will pair with this node as DR partner
Four node_A_1 4068741258 1574774970 node_B_1
node_A_2 4068741260 1574774991 node_B_2
node_B_1 4068741254 unchanged node_A_1
node_B_2 4068741256 unchanged node_A_2
Two node_A_1 4068741258 1574774970 node_B_1
node_B_1 4068741254 unchanged node_A_1
Note: In a four-node MetroCluster configuration, the system determines DR partnerships by pairing the node with the lowest system ID at site_A and the node with the lowest system ID at site_B. Because the system IDs change, the DR pairs might be different after the controller replacements are completed than they were prior to the disaster.

In the preceding example:

  • node_A_1 (1574774970) will be paired with node_B_1 (4068741254)
  • node_A_2 (1574774991) will be paired with node_B_2 (4068741256)

Procedure

  1. With the node in Maintenance mode, display the local system ID of the node from each node: disk show
    In the following example, the new local system ID is 1574774970:
    *> disk show
     Local System ID: 1574774970
     ...
  2. On the second node, repeat the previous step.
    Note: This step is not required in a two-node MetroCluster configuration.
    In the following example, the new local system ID is 1574774991:
    *> disk show
     Local System ID: 1574774991
     ...