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Dell PowerVault ME4 Series Storage System Deployment Guide

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Power cable connection

Connect a power cable from each PCM or PSU on the enclosure rear panel to the PDU (power distribution unit) as shown in the following figures:

Figure 1. Typical AC power cable connection from PDU to PCM (2U)
Typical AC power cable connection from PDU to PCM (2U)
  1. Controller enclosure with redundant PCMs
  2. Redundant PCM to PDU (AC UPS shown) connection
Figure 2. Typical AC power cable connection from PDU to PSU (5U)
Typical AC power cable connection from PDU to PSU (5U)
  1. Controller enclosure with redundant PSUs
  2. Redundant PSU to PDU (AC UPS shown) connection
NOTE:The power cables must be connected to at least two separate and independent power supplies to ensure redundancy. When the storage system is ready for operation, ensure that each PCM or PSU power switch is set to the On position. See also Powering on).
CAUTION:Always remove the power connections before you remove the PCM (2U) or PSU (5U84) from the enclosure.

Testing enclosure connections

See Powering on. Once the power-on sequence succeeds, the storage system is ready to be connected as described in Connecting the enclosure to hosts.

Grounding checks

The enclosure system must be connected to a power source that has a safety electrical grounding connection.

CAUTION:If more than one enclosure goes in a rack, the importance of the grounding connection to the rack increases because the rack has a larger Grounding Leakage Current (Touch Current). Examine the grounding connection to the rack before power on. An electrical engineer who is qualified to the appropriate local and national standards must do the examination.

Powering on

CAUTION:Do not operate the enclosure system until the ambient temperature is within the specified operating range that is described in the system specifications section of the Dell PowerVault ME4 Series Storage System Owner’s Manual. If the drive modules have been recently installed, ensure that they have had time to adjust to the environmental conditions before they are used with production data for I/O.
  • Power on the storage system by connecting the power cables from the PCMs to the PDU, and moving the power switch on each PCM to the On position.
    • With 2U enclosures, the System Power LED on the 2U Ops panel lights green when the enclosure power is activated.
    • With 5U84 enclosures, The Power on/Standby LED on the 5U84 Ops panel lights green when the enclosure power is activated.
  • When powering up, ensure to power up the enclosures and associated data host in the following order:
    1. Drive enclosures—Ensures that the disks in the drive enclosure have enough time to completely spin up before being scanned by the controller modules within the controller enclosure. The LEDs blink while the enclosures power up. After the LEDs stop blinking the power-on sequence is complete. If the LEDs on the front and back of the enclosure are amber then a fault has been detected.
    2. Controller enclosure—Depending upon the number and type of disks in the system, it may take several minutes for the system to become ready.
    3. Data host—if powered off for maintenance purposes.
  • When powering off, reverse the order of steps that are used for powering on.
NOTE:If main power is lost for any reason, the system automatically restarts when power is restored.

Enclosure Ops panels

Guidelines for powering enclosures on and off

  • Remove the AC cord before inserting or removing a PCM (2U) or PSU (5U84).
  • Move the PCM or PSU switch to the Off position before connecting or disconnecting the AC power cable.
  • 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.
  • A 5U84 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.
  • 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 5U84 to full power from standby.

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