1. A computer-implemented method of operating system update management for a shared pool of configurable computing resources having a plurality of logical partitions (LPARs), the method comprising: receiving an operating system update request for the shared pool of configurable computing resources; classifying, with respect to a set of original files on a set of original nodes, a set of original shared portions and a set of original individualized portions, wherein a respective original file of the set of original files has a respective original shared portion and a respective original individualized portion; creating, for the set of original files on the set of original nodes, a set of original overlay links including a respective original overlay link for the respective original file of the set of original files; routing a set of operating system network traffic using the set of original overlay links; establishing, to succeed the set of original files on the set of original nodes, a set of successor files on a set of surrogate nodes, wherein a first respective successor file of the set of successor files maps to a single successor shared storage segment and a first respective successor individualized storage segment, and wherein a second respective successor file of the set of successor files maps to the single successor shared storage segment and a second respective successor individualized storage segment; creating, for the set of successor files on the set of surrogate nodes, a set of successor overlay links including: a successor shared overlay link which maps to the single successor shared storage segment, a first respective overlay link which maps to the first respective successor individualized storage segment, and a second respective overlay link which maps to the second respective successor individualized storage segment; and routing, in place of the set of original overlay links, the set of operating system network traffic using the set of successor overlay links.