Operator’s (Ops) panel LEDs 93
NOTE: Guidelines for consideration when powering enclosures on and off
• Remove the AC power cord before inserting or removing a PCM (2U) or PSU (5U).
• Move the PCM or PSU power switch to the off position before connecting or disconnecting the AC power cord.
• Allow 15 seconds between powering off and powering on the PCM or PSU.
• Allow 15 seconds before powering on one PSU or PCM in the system, and powering off another PCM or PSU.
• Never power off a PCM or PSU while any amber LED is lit on the partner PCM or PSU.
• The enclosure must be left in a power on state for 30 seconds following resumption from standby, before the
enclosure can be placed into standby again (applies to 5U84 only).
• Although the enclosure supports standby, the expansion module shuts off completely during standby and cannot
receive a user command to power back on. An AC power cycle is the only method to return the enclosure to full
power from standby (applies to 5U84 only).
Operator’s (Ops) panel LEDs
Once the enclosure has successfully powered on, you can observe its Ops panel–located on the left ear of the front
panel–for LED behavior reflecting enclosure status. Refer to the appropriate figure/table from the options below
for descriptions of enclosure status LEDs and related fault conditions.
• For 2U12 and 2U24 enclosures, see Figure 31 (page 37).
• For 5U84 enclosures, see Figure 32 (page 38).
Unit Identification Number
The Unit Identification Display (UID) is a dual seven segment display that is used to provide feedback to the user.
Its primary purpose is to display an Enclosure UID number to assist in setting up, monitoring, and managing
storage systems comprised of multiple enclosures.
The UID is stored in the enclosure VPD and is used by management interfaces (CLI and the SMC). The UID can
drive all seven of the segments, plus the dot/decimal point in each character of the display.
Software/SES
The enclosure UID number can be read and set through the management interfaces and SES.
Disk drive LEDs
Disk modules used in 2U chassis
Each disk drive module includes two LEDs (green and amber) as shown in “Disk drive carrier module LEDs”
(page 97).
• In normal operation, the green LED will be on and will blink as the drive operates.
• In normal operation, the amber LED state will be:
Off if a disk is not present
Off as the disk successfully operates
On if there is a disk fault
DDICs used in 5U chassis
Each disk has a single amber drive fault LED as shown in “DDIC LED” (page 102). If the LED is illuminated, a
disk failure condition has occurred. The DDIC should be replaced as soon as possible, using the procedure
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