Enclosure Chassis - Seagate Exos E 4U106 Hardware Installation And Maintenance Manual

• Populate the remaining drive slots from enclosure from front to back – filling an entire lateral row (e.g., drives
0-11) - before populating the next row (e.g., drives 12-23, drives 24-34), and so on.
NOTE: A row can be skipped during loading, except the first row (Drive slot 0 to Drive slot 11). However, once
you start to fill a row ensure that you fill it completely.
• When rack-mounting a 4U106 enclosure, install the drives after the enclosure is installed in the rack.
• Populate drive slots 96–105 at any time during the sequence, as they are cooled separately within the enclosure.

Enclosure chassis

The 4U106 chassis consists of a sheet metal enclosure with integrated PCBAs. The enclosure is divided into a main
bay and a controller bay. Each bay has a removable cover to provide access to plug-in modules known as
field-replaceable units (FRUs). 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") for a 4U enclosure. Optional lift handles on the chassis side walls facilitate hoisting
and installation. See also
• 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 drive channel bus-bar distributes power from the power midplane to 24 HDD baseplanes.
• The four 24 HDD baseplane PCBAs support 96 drive connections in the drive channel.
• The 10 HDD baseplane PCBs supports 10 drive connections in the controller channel.
• The enclosure top panel provides access to 106 low profile 3.5" LFF or 2.5" SFF (with adapter) drives, held vertically.
Out of these 106 drives, 96 drives are present below cover A (main bay cover), and 10 drives (and two controller
channel fans) are present below the cover B (controller bay). See
plug-in drive carrier module. The top panel also provides access to the HS expander and controller fan FRUs.
• Each 24 HDD base plane has a pair of hot-swappable expander cards (eight individual hot-swappable expander
cards). Each expander card plugs into a riser card that in turn connects to a baseplane.
• Within the controller bay, fans provide additional cooling for IOMs.
• In the rear, the chassis holds two PSUs, four system fans, two CFF-compliant IOMs and a cable management
arm to manage data & power cables.
• The main bay cover A, provides access to 96 low profile 3.5" LFF or 2.5" SFF with adapter drives, held
vertically. It also provides access to eight High Speed expander FRUs.
• The controller bay cover (cover B) provides access to 10 low profile 3.5" LFF or 2.5" SFF with adapter drives,
held vertically. It also provides access to two controller fan FRUs.
IMPORTANT: If the Exos E 4U106 enclosure is configured with a single IOM, it must be installed in IOM0 (as shown
in Figure 11). An IOM blank must be installed in the adjacent slot to ensure sufficient air flow through the enclosure
during operation.
24 System overview
Figure 24 (page 42).
Figure 9 for more details. Each drive slot holds a