System Overview 21
NOTE: Customers select a chassis type and drives separately. All empty drive slots in the 2U chassis
must have drive blanks installed.
The 2U chassis supports the following form factors:
• 2U12 chassis configured with 12 LFF disks (see Figure 15 on page 16) as follows:
• Twelve 3.5” SAS LFF disk drives, held horizontally
•Twelve 3.5” SATA LFF disk drives, held horizontally
• 2U24 chassis configured with 24 SFF disks (see Figure 16 on page 16) as follows:
• Twenty-four 2.5” SAS SFF disk drives, held vertically
• Twenty-four 2.5” SATA SFF disk drives, held vertically
• 2U12 empty chassis with midplane and module runner system: see Figure 24 on page 21
• 2U24 empty chassis with midplane: see Figure 25 on page 22
The chassis has a 19-inch rack mounting that enables it to be installed onto standard 19-inch racks
and uses two EIA units of rack space (3.5”) for a 2U chassis.
• The midplane PCB can support either 12 or 24 drive connections.
• There are either 12 or 24 drive slots at the front of the chassis, in horizontal (12) or vertical (24)
orientation, as defined by the chassis variant.
• See also Figure 15 and Figure 16 on page 16.
• Each drive slot holds a plug-in drive carrier module that can hold these drive types, dependent
upon the chassis type:
• At the rear, the chassis assembly can hold a maximum of two PSUs and two RAID controllers or
SBB-compliant expansion IOMs.
Front of 2U12 RAID or Expansion Chassis
Figure 24 provides an illustration of the front of the 2U12 RAID or expansion chassis (without drives
installed).
Figure 24 Front of 2U12 RAID or Expansion Chassis
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