Configuring an address-to-SC unit (A2SU) of each of a plurality of CPU chips based on a number of valid SC chips in the computer system is disclosed. The A2SU is configured to correlate each of a plurality of memory addresses with a respective one of the valid SC chips. In response to detecting a change in the number of valid SC chips, pausing operation of the computer system including operation of a cache of each of the plurality of CPU chips; while operation of the computer system is paused, reconfiguring the A2SU in each of the plurality of CPU chips based on the change in the number of valid SC chips; and in response to reconfiguring the A2SU, resuming operation of the computer system.