Moving from back-to-back topology to switched topology in an InfiniBand network

A system, comprising

• a memory comprising computer-executable instructions;
• and
• a first storage controller;
• a second storage controller;
• a processor executing the computer-executable instructions, the computer-executable instructions when executed by the processor cause the processor to perform operations comprising:
• prior to connecting a switch for the storage controller in a network and during reboot of the first storage controller;
• waiting for the second storage controller in the network to become master, the second storage controller is active;
• upon the second storage controller becoming master, changing cache files for local ports on the first storage controller regarding local identifier (LID) assignments;
• restarting a system manager for the second storage controller;
• connecting the first storage controller to the network with the LID assignments provided by the changed cache files for the first storage controller;
• upon the first storage controller becoming active, rebooting the second storage controller;
• changing LID assignments for local ports on in the second storage controller;
• and
• adding the switch to the network.

A computer program product embodied on a non-transitory computer readable medium, the computer program product including instructions that, when executed by a computer causes the computer to perform operations comprising

• prior to connecting a switch for a first storage controller in a network and during reboot of the first storage controller:
• waiting for a second storage controller in the network to become master, the second storage controller is active;
• upon the second storage controller becoming master, changing cache files for local ports on the first storage controller regarding local identifier (LID) assignments;
• restarting a system manager for the second storage controller;
• connecting the first storage controller to the network with the LID assignments provided by changed cache files for the first storage controller;
• upon the first storage controller becoming active, rebooting the second storage controller;
• changing LID assignments for local ports on the second storage controller, and
• adding the switch to the network.