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The term oversubscription refers to the various methods by which more resources than physically is allocated on a vSphere datastore. Oversubscription enables administrators to make use of idle resources thereby maximizing the enterprise’s storage efficiency without downtime. However, once an oversubscribed resource gets exhausted, stability issues can creep up along with other many other issues like virtual machine startup failures, snapshot creation glitches, erratic performance and data loss. Moreover, retrieving lost data is a very costly affair.