Embodiments for preemptive deep diagnostics of resources in a disaggregated computing environment. Respective resources from respective pools of resources of different types are assigned to compose a disaggregated server. A workload is executed by the respective resources within the disaggregated server while the respective resources of the disaggregated server are monitored by a monitoring task. Responsive to a first resource of the respective resources generating an alert from the monitoring task, the workload is instantiated to be concurrently performed by the first resource and a second resource of the respective resources while initiating a health check diagnostic operation on the first resource.