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Remote Power Control for the disk array enclosure

IP.com Disclosure Number: IPCOM000015533D
Original Publication Date: 2002-Apr-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 3 page(s) / 79K

Publishing Venue

IBM

Abstract

Disclosed is a system for the computer and storage system made of multiple enclosures with individual power supply units to be turned on or off altogether by a single system power switch. Each enclosure contains a Remote Power Controller and one or more power supply units that are controllable by the remote power controller. The power supply unit always supplies the stand-by power to the remote power controller. The main output of the power supply unit is enabled or disabled by the remote power controller. The remote power controller has an input port and an output port for the external connection. The output port of one enclosure is connected to the input port of the next enclosure by a cable and the multiple enclosures form a remote power control loop as Figure 1. The cable carries two signals; one is a power control signal and the other is a heartbeat signal. The power control signal is a request to turn on or off the enclosure and the heartbeat signal transmits the status of the enclosure to the next enclosure. Power Control Signal Heartbeat Signal

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Remote Power Control for the disk array enclosure

Disclosed is a system for the computer and storage system made of multiple enclosures with individual power supply units to be turned on or off altogether by a single system power switch.

Each enclosure contains a Remote Power Controller and one or more power supply units that are controllable by the remote power controller. The power supply unit always supplies the stand-by power to the remote power controller. The main output of the power supply unit is enabled or disabled by the remote power controller. The remote power controller has an input port and an output port for the external connection. The output port of one enclosure is connected to the input port of the next enclosure by a cable and the multiple enclosures form a remote power control loop as Figure 1. The cable carries two signals; one is a power control signal and the other is a heartbeat signal. The power control signal is a request to turn on or off the enclosure and the heartbeat signal transmits the status of the enclosure to the next enclosure.

Power Control Signal

Heartbeat Signal

In

Out

Remote Power Controller

Master

Enclosure 1

Enclosure 2

Enclosure 3

cable

Remote Power Controller

 In Out

Slave

Remote

Remote Power Controller

 In Out

Slave

Power

Control Loop

:

:

:

:

Enclosure n

Remote Power Controller

 In Out

Slave

Figure 1. Remote power control system overview

One of the remote power controllers in the loop becomes a master controller and others follow a master controller as a slave controller. The master controller has a system power switch. The master controller also initiates a sequence of the system power activation or deactivation with this switch. When the system power switch is turned on or off, the master controller asserts the power control signal. As each slave controller redistributes the signal to the next enclosure step by step, the power control request should be returned to the master controller eventually. If it does not returned, it indicates that a failure occurs on a cable or the remote power controller, and the power control sequence does not complete.

When the incoming power control signal is asserted, the remote power controller enables the main output of its own power supply unit and the enclosure starts the power-on procedure. At the successful completion of power -on procedure, the remote power controller asserts the pow...