Chassis and Power Supplies
Power Supply Redundancy
OmniSwitch 8800 Hardware Users Guide
December 2004
page 2-17
Power Supply Redundancy
While the switch is running, all power supplies installed and operating share the electrical load. If a power
supply is physically removed from the chassis or fails unexpectedly, the remaining power supplies auto-
matically take up the load without disrupting the switch. However, for this failover to work, you must
have at least one redundant power supply installed and running in your switch at all times.
Redundancy Defined
Power supply redundancy is defined as having at least one power supply more than the minimum switch
requirement (N+1). The minimum switch requirement is based on the number of CMM, SFM, and NI
modules installed. The OmniSwitch 8800 supports up to a maximum of four power supplies per chassis.
Three power supplies will provide N+1 resiliency to support configuration with up to eight NIs installed;
four power supplies will provide N+1 resiliency for configuration with more than eight NIs installed.
Monitoring Power Supply Status.
To check the number of power supplies currently operating, and the
status of each power supply, use the
command. For example:
-> show power supply 1
Module in slot PS-1
Model Name:
OS8-PS-1375A,
Description:
OS8-PS-1375A,
Part Number:
901978-10,
Hardware Revision:
,
Serial Number:
B42N101P2,
Manufacture Date:
OCT 18 2002,
Firmware Version:
,
Admin Status:
POWER ON,
Operational Status:
UP
Power Provision
1375
For more information about these displays, see the “Chassis Management and Monitoring Commands”
chapter in the
OmniSwitch CLI Reference Guide
.
Adding a Power Supply
You can add a power supply to the chassis at any time without disturbing the switch’s network functions.
You are not required to power down the switch to add a power supply.
Hot Swapping a Power Supply
Hot swapping a power supply refers to the action of
replacing
a power supply while the switch is operat-
ing. To hot swap a power supply without disrupting switch operations, you must first have power supply
redundancy (N+1). Otherwise, switch operations may be disrupted.
