Alcatel-Lucent OMNISWITCH 6800 - Manual (Page 19)

OmniSwitch 6800 Series Availability Features
OmniSwitch 6800 Series Hardware Users Guide June 2007 page 1-5
Software Rollback
Software rollback (also referred to as image rollback) essentially allows the OmniSwitch 6800 Series
switches (in both standalone and stacked configurations) 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 OmniSwitch
6800/6850/9000 Switch Management Guide.
Backup Power Supplies
OmniSwitch 6800 Series switches support an optional backup power supply shelf. The backup power
supply shelf is a separate, rack-mountable chassis offering power supply bays for up to eight 225 watt
power supply modules. This provides redundant chassis power on a 1:1 basis.
Backup power supplies operate in active standby mode. If the primary power supply fails unexpectedly,
the backup power supply automatically takes up the full power load without disrupting the switch.
Note. For more information on backup power supplies, refer to Chapter 2, “OmniSwitch 6800 Series
Chassis and Hardware Components.”
Hot Swapping
Hot swapping refers to the action of adding, removing, or replacing components without powering off
switches or disrupting other components in the switch or stack. This feature facilitates hardware upgrades
and maintenance and allows users to easily replace components in the unlikely event of hardware failure.
The following hardware components can be hot swapped:
• OS6800-BPS-225 backup power supplies
• Backup power supply connector cables
• Backup power supply daughtercard module
• SFPs
• Modules operating in idle status within a stacked configuration (see Chapter 3, “Managing
OmniSwitch 6800 Series Stacks.” )
• Stacking cables (see note below)
Note. Stacking cables can be hot swapped as long as the stack is not split into two or more separate stacks
in the process. In addition, a redundant cable connection must always be in place before swapping
stacking cables. Otherwise, stack operations may be disrupted. For information on stacking cables, refer to
Chapter 2, “OmniSwitch 6800 Series Chassis and Hardware Components.”
For instructions on hot swapping backup power supplies, refer to Chapter 2, “OmniSwitch 6800 Series
Chassis and Hardware Components.” For instructions on hot swapping combo port SFPs, refer to the
instruction card provided with the SFP product. For instructions on hot swapping modules within a
stacked configuration, refer to
Chapter 3, “Managing OmniSwitch 6800 Series Stacks.”