Chapter 6. IBM System x3850 X5 and x3950 X5 255
Figure 6-31 IMM System Status with a hard drive failure
Virtual light path diagnostics
If you are standing in front of the server, it is easy to track this problem by noticing the first tier
of light path diagnostics, with the error light on the operator panel at the front of the server and
on the rear of the server.
Pulling out the front operator panel reveals the second tier of light path diagnostics (as shown
in Figure 6-32) that indicates the hardware subsystem that is experiencing the error.
Figure 6-32 Tier 2 of light path diagnostics
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