Symantec NetBackup 5220, Hardware Troubleshooting Manual

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I/O module LEDs
I/O module LED descriptions
LED States Description
SAS IN port Solid green
Flashing green
Red
Not lit
Link available
Activity
n/a
No link available
SAS OUT port n/a Not operational at this time.
I/O module Solid green
Flashing green
Red
Not lit
Ready
n/a
Starting up
Off
Note: When starting up the Symantec Storage Shelf, the primary I/O module
(on the left side of the rear panel) starts up first. Its LED turns green a few
seconds after the main startup. The LED of the secondary I/O module (on the
right of the rear panel) will start after the primary module is operational.