Unable is about not being able to perform an action or achieve a result due to certain circumstances. Fail is about making an effort and getting an unsuccessful result. Cannot is about not having the general possibility to do something.
Examples
- Unable to perform the operation because the current plan state is {stateName}. [circumstances that prevent us from performing the action]
- Unable to use the precalculated location because the IVR property of the recovery location has been modified. [circumstances that prevent us from performing the action]
- Failed to find the target datastore {task.Spec.DatastoreName}. [we tried but did not succeed]
- Failed to delete the account. [we tried but did not succeed]
- You cannot select more than ${maxItems} items. [no general possibility to perform the action]
- Сhild clients cannot create their own clients. [no general possibility to perform the action]