After You Update: Performing a Patch Rollback

After a cumulative patch is applied, the CLI command system patch-rollback allows administrators to revert to the last version that was installed on the system. For example:

* If a system was at 6.8.3 and cumulative update 6.8.4 is applied, it can be reverted to 6.8.3 through the system patch-rollback command.
* If a system was at 6.8.0 and cumulative update 6.8.4 is applied, it can be reverted to 6.8.0 because that was the last installed version. It cannot be reverted to 6.8.3.

This command can be used if a problem is found after the patch update, such as an issue identified in production that was not identified during testing, resulting in a degradation of capabilities.

Before using this command to revert to the last installed 6.8.x version, you must first download the 6.9 Rollback RPM Package from the Software Updates portal and install it.

As part of the patch rollback feature, users should be aware of the following:

* As best practice, users should always take a data backup before an update.
* This command cannot be used after an upgrade to revert to an earlier major version (for example, 6.8.x).
* Although you can only roll back to the last version that was installed on the appliance, if multiple hotfix patches are included within the cumulative patch version you are rolling back from, then you can roll back multiple hotfix patches, one at a time, to a specific hotfix within the current version. To roll back to the previously installed version, you must first roll back each intervening hotfix patch.
* When this command is used in a cluster, it must be done to all the appliances in the cluster. The publisher must be rolled back first, followed by each subscriber individually. The rollback must be completed on all appliances in the cluster within 24 hours after the publisher rollback is initiated in order to maintain the cluster status.
* Any custom skins that are installed in the current version are retained after the rollback to the earlier version.
* System rollback events are logged in the Event Viewer.