Interposer Cable; Drive Drawer - Lenovo Flex System x220 Installation And Service Manual

Light path diagnostics LEDs and light path button
Light path diagnostics is a system of LEDs in the storage expansion node and the attached compute
node that you can use to diagnose problems. For more information, see "Light path diagnostics"
on page 22.

Interposer cable

The interposer cable connects the storage expansion node to the compute node.
The storage expansion node comes with an interposer cable that is connected to the system board. The free
end of the cable exits the storage expansion node near the left-rear corner. After you attach a compute
node to the expansion shelf, you connect the free end of the interposer cable to the interposer connector
on the compute node system board to establish the connection between the storage expansion node
and the compute node.

Drive drawer

The drive drawer in the storage expansion node contains 12 hot-swap drive bays.
The drawer accommodates up to 12 hot-swap SAS or SATA 2.5-inch hard disk drives or solid-state drives.
The drive drawer also has a bracket for the flash power module that is used with an optional flash/RAID
adapter.
The following illustration shows the layout of the drive bays in the drawer.
Attention:
• To ensure proper cooling and protect system data integrity, do not operate the storage expansion node
for an extended period of time with the drawer open. Keep the drive drawer closed when you are not
installing or removing drives.
• Make sure that the drive drawer is supported when it is open. The weight of installed drives can cause the
storage expansion node assembly to be unstable when the drive drawer is open.
To open the drawer, pull out on the handle and pull the drawer out, as shown in the following illustration.
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Flex System Storage Expansion Node Installation and Service Guide