Dell PowerVault 221S (SCSI) - Manual (Page 27)

Troubleshooting: Dell PowerVault 220S and 221S Systems Installation and Troubleshooting Guide
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When a problem exists with the storage system, one or more of the following events occur:
Amber shelf fault LED is illuminated
Audible alarm sounds (when enabled)
Drive(s) not seen during the host boot
If any of these events occur, perform the following diagnostic steps:
1. Is the green AC status LED indicator on the power supply(s) illuminated? (See Figure 1-7 .)
No. See " Troubleshooting a Power Supply ."
Yes. Go to step 2 .
2. Are the following system components updated with the latest firmware and device drivers?
Enclosure EMM
Hard-disk drives
Host bus adapter or PERC
No. Download the latest firmware and/or drivers from support.dell.com.
Yes. Go to step 3 .
3. Is the amber over-temperature LED on the front of the system illuminated? (See Figure 1-2 .)
No. Go to step 4 .
Yes. One or more temperature sensors are in the warning range. Check environmental conditions (high ambient
temperatures, ventilation blockage, etc.) and cooling modules for failures. Replace failed cooling modules (see