1. A method of implementing domain quotas within a data storage system, comprising: receiving at least one quota related to a size of a data domain, wherein the data domain associates a subset of data storage within a data storage system, wherein the size measures the subset, and wherein the at least one quota defines a threshold size for the data domain; receiving a data transaction that could change the size of the data domain; and determining whether the data transaction could cause the size of the data domain to pass the at least one quota in combination with a subset of other pending data transactions that could also change the size of the data domain.