Expansion canister ports and indicators

Expansion canisters can be optionally connected to systems.

Expansion canisters do not have any controls. As Rear view of expansion canister shows, each expansion canister has two SAS ports and several LED indicators. Each SAS port is a mini-SAS HD socket. SAS cables should be plugged in with the blue release tag oriented below the connector.

Figure 1. Rear view of expansion canister

1 SAS port 1 (inbound)
2 SAS port 2 (outbound)
3 Service port

Inbound SAS port 1 must be connected. This port 1 is used to connect the expansion enclosure to the system control enclosure. The expansion enclosure can be directly connected to the control enclosure or it can be chained through other expansion enclosures.

Outbound SAS port 2 is optional. This port 2 is used to connect this expansion enclosures to other expansion enclosures in the chain.

The Service port 3 should not be connected to any SAS cables.

Expansion canister LED indicators

LEDs on the back of each system expansion canister provide information about the status of the SAS ports and the expansion canister itself. As Expansion canister LED indicators shows, four indicator LEDs provide status information about the two SAS ports. Three indicator LEDs provide status information about the expansion canister itself.

Figure 2. Expansion canister LED indicators
Expansion canister ports

1 Link LED(x2–one per port)
2 Fault LED (x2–one per port)
3 Expansion canister power LED
4 Expansion canister status LED
5 Expansion canister fault LED

SAS port LED status summarizes the values of the LEDs on the SAS ports and links on a system expansion canister. A SAS link consists of four lanes, called phys.

Table 1. SAS port LED status .
Summary of LEDs for SAS ports on expansion canisters
Name	Callout	Symbol	Color	State	Meaning
Link	`1`	None	Green	OFF	No link connection on any phy.
Link	`1`	None	Green	ON	There is a connection on at least one phy.
Fault	`2`	None	Amber	OFF	No fault. All four phys have a link connection.
Fault	`2`	None	Amber	ON	This can indicate a number of different error conditions: Only 1, 2, or 3 lanes (phys) are connected, but not all 4. Not all 4 lanes are at the same speed. Not all lanes are connected to the same remote port.

Expansion canister LED status summarizes the LED status values on a system expansion canister.

Table 2. Expansion canister LED status.
Summary of LEDs for expansion canisters
Name	Callout	Color	State	Meaning
Power	`3`	Green	OFF	No power is available.
Power	`3`	Green	ON	Power is available.
Status	`4`	Green	OFF	The system code has not started, the system is off, in standby, or self test.
			BLINK	The canister is unable to read data from the midplane.
			ON	The canister machine code is active.
Canister fault	`5`	Amber	OFF	No faults requiring part replacement have been detected on the expansion canister.
			BLINK	The canister is being identified. There might or might not be a fault condition.
			ON	Either there is a fault which requires part replacement or the canister is still starting.