A computer program product may cause a processor to perform various operations in a composable computing system. The operations may include accessing a system resource database including, for each of a plurality of disaggregated computing hardware resources within the composable computing system, data corresponding to hardware characteristics for the hardware resource and a power domain characteristic of a power domain that supplies power to the hardware resource. The operations may further include identifying a workload request that requests performance of a workload and identifying a power domain requirement for the workload. Still further, the operations may include selecting a subset of the disaggregated computing hardware resources to be included in a first computing subsystem, wherein each hardware resource selected to be included in the first computing subsystem complies with the identified power domain requirement for the workload, provisioning of the first computing subsystem, and assigning the first computing subsystem to perform the workload.