## About the Data Services Platform

The Data Services Platform (DSP) provides virtualization services for the storage arrays in the system. It also provides Fibre Channel (FC) switching so that the system does not require additional switches.

The DSP's configuration information is stored in a resident flash card, which can be moved to a new DSP if the current DSP ever needs replacement. The following figure shows the DSP:

Front View:

Back View:

The DSP includes the following components:

- Power supplies - The DSP has two bays located at the top of the rear of the chassis, each containing 750-watt AC/DC power supply. These power supplies provide a nominal 48V DC power supply distributed across the chassis midplane. They are hot swappable and provide redundancy. It takes one power supply to power a fully loaded chassis.

The power supplies have dedicated cooling fans, which draw ambient air in from the front of the unit and out at the back. Each unit includes an integral thermal shutdown circuit in case of fan failure.

A detachable power cord is connected to each power supply. Latching handles prevent removal from the chassis until power is disconnected.

- Fan assembly - The fan assembly consists of two variable-speed DC-powered fans and a fan controller card (FCC). The fans draw ambient air into the chassis through the front intake vents and draw direct heated exhaust from the fan assembly. This configuration eliminates recirculation of exhaust air generated by other units in the same rack or adjacent racks. The fan assembly is hot swappable from the front of the system chassis.
- Management interface cards - The MIC is responsible for providing the system interface and management control functions for the DSP chassis. Each MIC has the following:

- High-performance microprocessor
- RJ-45 serial port
- 10/100 Ethernet port
- PCMCIA device (a PC card) for storing operational images and configuration storage

- Storage resource card (SRC) sets - The SRC set handles packet processing for the DSP's FC interfaces. Each card set consists of two boards that are interconnected through the chassis midplane:

- The SRC, the line-processing card, plugs into the front of the DSP chassis. Each processor on the SRC manages two corresponding ports on the SI O card.
- The SIO card plugs into the rear of the DSP chassis. The SIO card contains eight 2-gigabyte FC interfaces, or ports. The SIO card provides the actual physical interface to the storage arrays.

- SRC mezzanine - The SRC mezzanine provides a local memory cache for the processors and is equipped with 2 gigabytes of memory.
- Switch fabric card (SFC) - The SFC provides the central data path switching function for the DSP chassis.

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