A heat removal system for a computer has a heat sink and a spool rotatably disposed in the heat sink. A broadband light source illuminates an object and the reflected photons are processed using an interferometer, demodulated into inphase and quadrature components and then digitized. When the security channel interface is activated, the control unit provides a security channel to the user. Thus, the chassis provides dual zone temperature control to improve performance of the network storage system. The variation of the optical properties of the controllable regions may be achieved using a thermo-optic effect, an electro-optic effect, a stress-optic effect, or a mechano-optic effect, or by moving a material into or out of the controllable region. According to one embodiment of the present invention, a first node of a plurality of nodes is configured to process requests to access a shared data resource on behalf of the plurality of nodes, where the plurality of nodes includes a logical volume configuration server configured to present a logical volume to one or more logical volume configuration clients.