Methods, apparatus, and articles of manufacture are disclosed to improve resource allocation for virtualized server systems. An example apparatus includes a resource identifier to identify a set of external storage resources when a host storage solution is not identified, a storage cost calculator to calculate a cost corresponding to the external storage resource set by comparing a parameter of an external storage resource in the external storage resource set to a requirement, a cost analyzer to determine whether the cost satisfies a cost threshold by comparing the cost to a cost threshold, and a workload domain allocator to allocate the external storage resource set to the workload domain when the cost satisfies the cost threshold.