104CHAPTER 11: SOFTWARE UPGRADE AND INSTALLATION
system configuration file includes a record of the Webcache software version that was running when the configuration was saved.
The Restore Configuration operation restores the system configuration from the file to the Webcache. It checks that the system configuration being restored was created on the same Webcache software version as the one that the Webcache is running.
Example
You perform a software upgrade and experience problems with the Webcache. You now want to return the Webcache to a previous working software version. You need to install the previous software version and then restore the configuration that you saved prior to commencing the upgrade.
To do this, you need to install the software image of the previous software version. This is available either on the CD supplied with the Webcache or on the 3Com FTP site. The same software image is used for installation and for upgrades.
You need to perform a software installation to return the Webcache to a previous working software version. All of the Webcache’s configuration settings are lost after a software installation has been completed, except the IP and DNS configuration. You should now browse to the Webcache’s Web interface and restore the system configuration file that you saved the last time the Webcache was running this older software version. You would perform the Restore Configuration command to go back to a fully configured Webcache running the previous software version.
If you had not previously saved a system configuration file for the older software version, you would still be able to install a previous software image, but you would have to
CAUTION: You cannot restore a system configuration which was created on a different software version to the version that the Webcache is currently running.
Example: You save a configuration when the Webcache is running software version 1.00. You later perform a software upgrade to version
1.01and attempt to restore the 1.00 system configuration to the Webcache. The Web interface will not allow you to restore the configuration.
Therefore you should save a configuration file for each different software version that you run on the Webcache. If you need to go back to an
