TrueNAS M Series Basic Setup Manual page 4

The M-Series has one or two storage controllers in an over-and-under configuration. Examples of typical M40 (top)
and M50 (bottom) models are shown here.
1: Redundant power supplies
2: Serial port
3: 1Gb Ethernet Out of Band (OOB) dedicated man-
agement port, dual USB 2.0 ports
4: Dual USB 3.0 ports
5: 10Gb Ethernet port
6: 10Gb Ethernet port
7: VGA monitor port
M-Series systems with only a single storage controller must be shut down and powered off before removing
the controller, or data stored in the NVDIMM SLOG will be lost! Dual storage controller systems synchronize
data between each NVDIMM, but can lose data if both controllers are removed before being properly shut
down.
For remote management with IPMI, the 1 Gb Ethernet Out of Band management port (#3) must be connected to a
network.
8: ID LED
9: HD Mini SAS3 connectors
10: Networking port
11: Asterisk slot: Fibre Channel or additional network-
ing
12: Storage controller management port
13: NVMe activity indicators
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