System and method for supporting vm migration between subnets in a high performance computing environment

A system for supporting virtual machine migration in a high performance computing environment, the system comprising:

• a computer environment comprising:
• a network fabric, the network fabric comprising
• a first subnet, the first subnet comprising a first set of network switches, the first set of network switches comprising a gateway switch, the gateway switch having access to a memory;
• a second subnet, the second subnet comprising a second set of network switches;
• a virtual machine attached to the first subnet via a first virtual function, the virtual machine being associated with a first plurality of addresses, the first plurality of addresses comprising at least a global unique identifier (GUID), a global identifier (GID), and a destination local identifier (DLID);
• and
• a global fabric manager, the global fabric manager having administrative control within the first subnet and second subnet;
• wherein the virtual machine is configured to detach from the first virtual function;
• wherein the virtual machine is migrated from the first subnet to the second subnet, wherein after migration the virtual machine is associated with a second plurality of addresses, the second plurality of addresses comprising the GUID, a second GID, and a second DLID;
• wherein the virtual machine is attached to the second subnet via a second virtual function;
• and
• wherein, upon the migration, an entry to the memory is added, the entry comprising a set of addresses of the second plurality of addresses of virtual machine.

A non-transitory machine readable medium, including instructions stored thereon for supporting virtual machine migration in a high performance computing environment, which when read and executed by one or more computers caused the one or more computers to perform steps comprising:

• providing, at one or more computers, including one or more microprocessors
• a network fabric, the network fabric comprising
• a first subnet, the first subnet comprising a first set of network switches, the first set of network switches comprising a gateway switch, the gateway switch having access to a memory;
• a second subnet, the second subnet comprising a second set of network switches;
• a virtual machine attached to the first subnet via a first virtual function, the virtual machine being associated with a first plurality of addresses, the first plurality of addresses comprising at least a global unique identifier (GUID), a global identifier (GID), and a destination local identifier (DLID);
• and
• a global fabric manager, the global fabric manager having administrative control within the first subnet and second subnet;
• detaching the virtual machine from the first virtual function;
• migrating the virtual machine from the first subnet to the second subnet, wherein after migration the virtual machine is associated with a second plurality of addresses, the second plurality of addresses comprising the GUID, a second GID, and a second DLID;
• attaching the virtual machine to the second subnet via a second virtual function;
• and
• adding an entry to the memory, the entry comprising a set of addresses of the second plurality of addresses of virtual machine.