Enclosure chassis

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An overview of the Disk Enclosure.

The Disk Enclosure consists of a sheet metal enclosure with integrated boards and a module runner system. The enclosure contains a drive channel and a controller channel, and features removable top cover lids. Enclosure top and rear panels provide access to plug-in modules known as customer-replaceable units (CRUs). Each enclosure is made of sheet steel that is bonded together using rivets, welding, and other forced contact methods. The metal surfaces are free from non-conductive coatings and paint.
  • The chassis has a 1.2 m rack mounting that enables it to be installed onto standard 1.2 m racks, and uses four EIA units of rack space (7 inches) for a 4U enclosure. Optional lift handles on the chassis side walls facilitate hoisting and installation. See Figure 2.
  • The Cable Management Arm (CMA) routes cables from the controller channel and external connections, and secures them for in-rack servicing of the installed enclosure. The rails slide outward from the installed position.
  • An internal high-speed harness ensures routing of cables controlled to specification; protects the interfaces between cables and connectors; and provides a connector system designed for positive (latched) mating.
  • The drive channel bus-bar distributes power from the power mid-plane to 24 hard disk drive base-planes.
  • Four 24 hard disk drive base-plane boards support 96 disk drive connections in the drive channel.
  • A ten hard disk drive base-plane board supports 10 disk drive connections in the controller channel.
  • The enclosure top panel provides access to LFF (with adapter) disks, held vertically. Each drive slot holds a plug-in drive carrier module. The top panel also provides access to the HS expander and controller fan CRUs.
    Note: Top panel enclosure lids A and B slide out, and can be temporarily removed for a servicing event. See Figure 1.
  • Four removable HS expanders connect to 24 hard disk drive base-planes via expander link cards, providing high availability.
  • Within the controller channel compartment, channel fans provide additional cooling the IOM.
  • Within the rear panel, the chassis assembly is populated with two PSUs, four system fans, are an IOM, and the flattened cable coils held by the bracket assembly on the CMA shelf (atop system fan sheet metal).