Base enclosure component descriptions
Base enclosure component overview
The 2U, 25-drive base enclosure consists of the following components:
• Slots for 25 2.5-inch drives
• Midplane
• Node
• Power supply module
• EMI shielding
Drives
Each drive resides in a drive carrier. The drive carriers are metal and plastic assemblies that provide smooth, reliable contact with the
enclosure slot guides and mid-plane connectors. Each carrier has a handle with a latch and spring clips. The latch holds the drive in place
to ensure proper connection with the mid-plane. Drive activity and fault LEDs are on the front of the enclosure.
There are three supported drive types:
• NVMe NVRAM
• NVMe SSD
• NVMe SCM
You can visually distinguish between drive types by their different latch and handle mechanisms and by the labels on each drive.
Slots 0 through 20 can be populated with either NVMe SSD or NVMe SCM drives. You cannot mix NVMe SSD and NVMe SCM drives in
the same base enclosure. NVMe NVRAM drives are used for system caching and can only be installed in the last four slots (21 through 24)
of the base enclosure. In configurations that only use two NVMe NVRAM drives, slots 21 and 22 must remain empty.
NOTE:
A minimum of six NVMe SSD or NVMe SCM drives and two or four NVMe NVRAM drives, depending on the
model, must be installed in the base enclosure. If the minimum number of drives is not populated, the base enclosure
will not initialize.
NOTE: You cannot add additional NVMe NVRAM drives to models that ship with two.
WARNING: NVMe NVRAM drives are used for caching and are battery backed up. Never remove NVMe NVRAM drives
unless you are replacing a faulted drive. Improperly removing an NVMe NVRAM drive could result in data loss.
Midplane
The mid-plane separates the front-facing drives from the rear-facing nodes. It distributes power and signals to all components in the
enclosure. The nodes and drives plug directly into the mid-plane.
Node
Each base enclosure contains two nodes. The node is the intelligent component providing the compute capability of the base enclosure.
Node power supply module
Each node contains a power supply module that connects the system to an exterior power source. If one power supply fails, redundant
power supplies can keep the entire base enclosure running. The power supplies include LEDs to indicate component status. A latch on the
module locks it into place to ensure proper connection.
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