User guide

Managing CMM Directory Content Managing Redundant CMMs

OmniSwitch 7700/7800/8800 Switch Management Guide April 2006 page 4-21

Synchronizing the Primary and Secondary CMMs

If you have a secondary CMM in your switch, it will be necessary to synchronize the software between the

primary and secondary CMM. If the primary CMM goes down (for example, during a reboot), then the

switch fails over to the secondary CMM. If the software in the secondary CMM is not synchronized with

the software in the primary CMM, the switch will not function as configured by the administrator.

The synchronization process is shown in the diagram below:

In the above diagram:

1 The primary CMM copies its certified directory to the secondary CMM working directory (remember

that you cannot copy files directly to the certified directory, they must first be copied to the working direc-

tory).

2 An automatic reboot is then triggered on the secondary CMM, loading the new contents of the work-

ing directory to the running configuration.

3 If no problems exist, then the working directory is automatically copied to the certified directory of the

secondary CMM.

If the secondary CMM fails to boot properly, then the contents of the secondary CMM’s certified direc-

tory overwrite the new software on the working directory of the secondary CMM. This has the effect of

denying the attempted synchronization process.

This process copies the files in the certified directory of the primary CMM to the certified directory of the

secondary CMM. This prevents the secondary CMM from rebooting using incorrect or out-of-date soft-

ware should the primary CMM go down.

Working

Certified

Running

Working

Certified

Primary CMM Secondary CMM