1. A method, comprising: calculating a performance weight for each end user of an application executing on a computer processor, the performance weight calculated as a function of an activity level determined for each end user and a type of the application; calculating an input/output weight for each end user from a combination of an input/output requirement and the performance weight, the input/output requirement indicative of an amount of storage resources of a multi-tiered storage system associated with anticipated activities of the end user; and assigning an amount of the storage resources for each end user based on the input/output weight.