IBM 4957-J11, Hardware Installation And Maintenance Manual

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Table 12. LEDs: Controller channel fan module - top panel
Module LED
LED behavior states
Channel Fan Status LED Channel Fan OK (Off) Fan fault ID (amber/
blinking amber)
Power off (Off)
HS Expander module
The replacement procedure should be completed within an absolute maximum of 3 minutes.
Figure 21. HS expander module - top panel
Table 13. HS expander module LEDs
Module LED
LED behavior states
HS Expander Status LED Expander OK (Off) Expander fault ID
(amber/blinking amber)
Power off (Off)
Enclosure management
IOMs actively manage the enclosure. Each module has a SAS expander with its own storage enclosure
processor (SEP) that provides a SES target for a host to interface to through the ANSI SES Standard. If one
of these modules fails, the other module will continue to operate.
Chapter 3. System overview 23