Chassis servicing and migration in a scale-up NUMA system

An apparatus for facilitating replacement of a failing node with a spare node in a non-uniform memory access (NUMA) system, the apparatus comprising:

• a node-controller-initialization logic to, in response to determining that a node-migration condition is met, initialize a node controller of the spare node such that accesses to a memory local to the spare node are to be processed by the node controller;
• a processor-state-migration logic to quiesce the failing node and the spare node to allow states of processors on the failing node to be migrated to processors on the spare node;
• and
• a data-migration logic to, subsequent to unquiescing the failing node and the spare node, migrate data from the failing node to the spare node while maintaining cache coherence in the NUMA system and while the NUMA system remains in operation, thereby facilitating continuous execution of processes previously executed on the failing node;
• wherein the directory comprises a partial directory;
• wherein the node-controller-initialization logic is to mark every cache line in the local memory of the spare node as corrupted;
• and
• wherein the data-migration logic is to coherently fetch the cache line from the failing node in response to determining that a requested cache line in the local memory of the spare node is marked as corrupted and write the fetched cache line to the local memory of the spare node.