Optional parameter. It indicates the estimated size that the workspace may have. It has to be in MB.
If provided, the Disk allocation strategy ensures that the selected disk has at least as much usable space left as the estimated workspace size.
For example, let's suppose we want to select the disk with the highest read speed, but that has a minimum usable space of 100 MB. The Pipeline code for that is:
def extWorkspace = exwsAllocate diskPoolId: 'diskpool1', strategy: fastestReadSpeed(estimatedWorkspaceSize: 100) // ...