Availability Features OmniSwitch OS6855 Family
page 1-4 OmniSwitch 6855 Series Hardware Users Guide March 2009
Availability Features
OS6855 switches incorporate advanced Alcatel-Lucent Operating System (AOS) protocols to ensure high
availability for mission critical applications. Availability features are hardware- and software-based safe-
guards that help to prevent the loss of data flow in the unlikely event of a subsystem failure.
In addition, some availability features allow users to maintain or replace hardware components without
powering off the switch or interrupting switch operations. Combined, these features provide added
resiliency and help to ensure that the switch or virtual chassis is consistently available for high-impact
network operations.
Hardware-related availability features include:
• Software Rollback
• Hot Swapping
• Hardware Monitoring
• Backup Power Supplies
Software Rollback
Software rollback (also referred to as image rollback) essentially allows the OmniSwitch 6850 Series of
switches to return to a prior “last known good” version of software in the event of a system software
problem. The switch controls software rollback through its resilient directory structure design
(i.e., /flash/working and /flash/certified).
For detailed information on the software rollback feature, as well as the switch’s /flash/working and
/flash/certified directories, refer to the “Managing CMM Directory Content” chapter in the Switch
Management Guide.
Hot Swapping
Hot swapping refers to the action of adding, removing, or replacing components without powering off
switches or disrupting other components.This feature facilitates hardware upgrades and maintenance and
allows users to easily replace components in the unlikely event of hardware failure.
The following OmniSwitch 6855 components can be hot swapped:
• Backup power supplies
• Backup power supply connector cables
• SFPs
Note. For instructions on hot swapping backup power supplies, refer to Chapter 3, “Mounting OS6855-24
and OS6855-U24” or Chapter 4, “Mounting OS6855-14 and OS6855-U10 Switches” For instructions on
hot swapping combo connector SFPs, refer to the instruction card provided with the SFP.
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