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Technical Guide Book for PowerVault MD3200MD3220

the firmware, and protect data until it can be written safely to the hard disk drives. The MD3200’s

architecture is designed to excel in multi-host systems environments. Its I/O system core provides built-in

hardware XOR for high-speed RAID parity calculations – enabling it to easily handle very compute-intensive

tasks. Each RAID controller contains 2GB of cache for a total of 4GB of cache in a dual controller

configuration which is mirrored with the other controller’s cache for high availability. In the event of a

power failure, the controllers are protected with battery assisted persistent cache backup which destages

cache to non-volatile media for indefinite safe keeping.

Each controller has a 36-port 6 Gb/s SAS expander that provides access to the drives in the MD3200 or

MD3220 enclosure. The SAS expanders enable each controller to access all of the drive ports, creating

active/active drives loops that provide both controllers redundant access to all attached disk drives.

Each controller has the following external connections:

• Four 6Gb SAS ports for host connectivity

• One 6 Gb/s SAS port for drive enclosure expansion for additional capacity

• One Ethernet management ports for LAN out-of-band management

• One PS/2 serial interface for service

Figure 2. MD3200 RAID Controller Module View – LEDs

Location

LED Term Color Icon General Behavior

1 Power Green

OFF = No power applied

ON = Power is applied

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