Remove Power From The 2U Enclosure; Set The Unit Identification Number - Seagate Exos E 2U12 Series Hardware Installation And Maintenance Manual

Remove power from the 2U enclosure

The 2U enclosure relies on main power provided through separate, independent power distribution. If you lose main power for
any reason, the 2U enclosure automatically restarts after power restoration.
You must quiesce all data exchange before removing power to the 2U enclosure.
To remove power from the 2U enclosure:
CAUTION Never remove power from a redundant power cooling module (PCM) when the other PCM has a fault
condition, indicated by an amber LED.
1. After you complete the proper shut down of the application and when you are ready to power down the expansion
enclosure, face the rear of the rack cabinet and switch off the power for the faulty PCM PSU.
2. Disconnect each power connector from the power distribution unit (PDU).
3. You must wait a minimum of 15 seconds before power cycling the PCM and a minimum of 30 seconds after successful
completion of the power on sequence before you attempt to place the PCM in standby or remove power again.

Set the unit identification number

The storage enclosure does not provide a default unit identification (UID) number during initial installation and setup. The
enclosure management software contained in the input/output module (IOM) controls how the system uses the UID. For the
first power on, the operator's (ops) panel flashes the numeric 00 and the storage enclosure continues its power on sequence,
even though it does not have a valid UID. Valid values are 00 to 99.
Once you set a UID for the storage enclosure, the enclosure management software stores that value in the midplane Vital
Product Data (VPD) and remains there through power cycles. In instances where the enclosure management software cannot
read the VPD, the storage enclosure displays the numeric 00.
If you configure the UID for other purposes, set the value using alternate software methods, rather than the following method.
To set the unit identification number (UID):
1. Press and hold the ops panel input switch above the Power on LED for 5 seconds until the left digit flashes.
2. Increment the number with each subsequent press of the input switch until you reach the desired value for that digit.
3. Press and hold the input switch for 5 seconds until the right digit flashes.
4. Increment the number with each subsequent press of the input switch until you reach the desired value for that digit.
5. Press and hold the input switch for 5 seconds to set the UID to the values on the display.
6. (Optional) To clear the UID back to the reserved value of 00, press and hold the input switch for 5 seconds.
Interpret system LEDs
Visual cues provide you with the means to monitor the expansion enclosure and its components and reinforce software
messages about system health. Use LEDs throughout the expansion enclosure to determine if there is a critical fault.
The expansion enclosure registers the following states using the identified LED colors.
1. Green or unlit LED: Indicates a module is functioning normally
2. Flashing green or amber LED: Indicates a non-critical condition
Chapter 6 Operation of 2U enclosures
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