The C-series and K-series 1U platforms share a common chassis but differ in drive count and NIC speed:

SKU Family SSDs HDDs NICs
C-72T C-series 4 × 480 GB 12 × 6 TB 2 × 25 GbE
C-168T C-series 4 × 960 GB 12 × 14 TB 2 × 25 GbE
K-144T K-series 3 × 800 GB 12 × 12 TB 2 × 10 GbE
K-168T K-series 3 × 800 GB 12 × 14 TB 2 × 10 GbE

HDD Top-Load Drawer (12 bays)

All four SKUs share the same 12-HDD top-load drawer arranged in a 3 × 4 grid. Bays are numbered left-to-right, top-to-bottom — bays 1–4 are at the back, bays 9–12 at the front.

                +-----------+-----------+-----------+-----------+
   BACK ----->  | HDD Bay 1 | HDD Bay 2 | HDD Bay 3 | HDD Bay 4 |
                +-----------+-----------+-----------+-----------+
                | HDD Bay 5 | HDD Bay 6 | HDD Bay 7 | HDD Bay 8 |
                +-----------+-----------+-----------+-----------+
                | HDD Bay 9 | HDD Bay 10| HDD Bay 11| HDD Bay 12|
   FRONT ---->  +-----------+-----------+-----------+-----------+

Front SSD Bays

The chassis has 4 front-facing SSD slots (Bay 13 through Bay 16).

C-series (C-72T, C-168T) — 4 SSDs

All 4 SSD bays are populated:

      +-----------+-----------+-----------+-----------+
      | SSD Bay 13| SSD Bay 14| SSD Bay 15| SSD Bay 16|
      +-----------+-----------+-----------+-----------+

K-series (K-144T, K-168T) — 3 SSDs

Bays 13–15 are populated; Bay 16 (rightmost) is unused:

      +-----------+-----------+-----------+-----------+
      | SSD Bay 13| SSD Bay 14| SSD Bay 15|  Unused   |
      +-----------+-----------+-----------+-----------+

NIC Ports

The Qumulo C-series platform uses a networking configuration where both back-end and front-end traffic are handled by the same NIC. Each node has 2 NIC ports on the rear of the chassis (plus a separate IPMI port).

                 NIC card (rear)
              +---------+
              | Port 1  |   <- top
              +---------+
              | Port 2  |   <- bottom
              +---------+

Linux interface names depend on NIC manufacturer (C-series uses Mellanox; K-series uses Intel):

NIC Manufacturer Port Location Port Label
Mellanox Top 1 (eth3)
Mellanox Bottom 2 (eth4)
Broadcom Top 1 (eth0)
Broadcom Bottom 2 (eth1)

Boot Drive

The boot drive is on the rear panel in the bottom row, which has 2 slots. The boot drive is located on the lower of the two slots available.

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