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We have some additional space available on the SAN disk array, but any substantial growth would require an investment in additional hardware (drive shelves and disk drives). However, once we add that hardware we can carve up additional space for any number of things and add it to the SAN-attached servers as needed.
Some of the non-SAN attached systems (the server running Blackboard, for example) face a direct limit - we generally buy thin, rack-mounted servers to conserve space, and adding disk to them directly isn't viable. As we move forward, iSCSI may become a viable alternative for such servers. For more information about types of networked storage, please read Introduction to Networked Storage.