IBM DS4700 manual Rear controller LEDs, controls, and connectors

Table 44. Rear controller LEDs, controls, and connectors (continued)

Number	LED	Normal Status	Problem Status
3	Cache Active	On - Data is in cache	Not applicable
		Off - Caching is turned
		off. No data in cache
4	Diagnostic	On - Seven-segment	Not applicable
		LEDs indicate diagnostic
		code
		Off - Seven-segment
		LEDs indicate enclosure
		ID
5	Heartbeat	Blinking	Off
6	Host Channel Speed - L1	See Table 45 on page 132.
7	Host Channel Speed - L2	See Table 45 on page 132.
8	Ethernet Link Speed	On - 100 Mbps	Not applicable
		Off - 10 Mbps
9	Ethernet Link Activity	On - link established	Not applicable
		Off - no link established
		Blinking - activity
10	Drive Channel Port	Off	On - No valid device
	Bypass	(Also off if no SFP	detected and port is
			bypassed
	(One LED per port)	connected)
	Note: The drive channel
	consists of two FC ports.
	This LED indicates the
	drive port bypass status
	of one of the two FC
	ports that comprise a
	drive channel. The LED
	marked 13 shows the
	status of the other port.
11	Drive Channel Speed - L1	See Table 45 on page 132.
12	Drive Channel Speed - L2	See Table 45 on page 132.
13	Drive Channel Port 2	Off	On - No valid device
	Bypass	(Also off if no SFP	detected and port is
			bypassed
	(One LED per port)	connected)
	Note: The drive channel
	consists of two FC ports.
	This LED indicates the
	drive port bypass status
	of one of the two FC
	ports that comprise a
	drive channel. The LED
	marked 10 shows the
	status of the other port.

The L1 and L2 LEDs for each host and drive channel combine to indicate the status and the operating speed of each host and drive channel.

Chapter 4. Operating the storage subsystem 131