During an upgrade you can revert a specific member that has already been upgraded and is within its revert time window. The revert single member feature is useful when you want to troubleshoot issues, such as service outages, on a specific member after it has been upgraded. You can revert a member only when the Grid upgrade is paused, and you cannot revert the Grid Master, reporting appliance, and an offline member. If the upgrade is paused and you have reverted a member in an upgrade group that has already completed the upgrade, you must move the member to another upgrade group that has not been upgraded before you can proceed with the upgrade.
Once a member is upgraded, the appliance starts counting down and displays the time that is left for you to revert this member. You can revert the member before the revert time window expires. The default time window to revert a member is 24 hours. You can view the time that is left to revert the member in the Member List view, as described in Grid and Memeber status below. You can also use the CLI commands set default_revert_window to configure the default revert time window for the Grid. Once a member exits the revert time window, you must revert the entire Grid in order to revert the member.
Note:
You may potentially lose some data when you revert a member. The appliance keeps information about DHCP leases and DNS records intact.
You cannot revert the upgrade of an upgrade group.
To revert a specific Grid member during a scheduled Grid upgrade:
From the Grid tab, select the Upgrade tab.
Pause the upgrade.
Click Toggle Member List View, and then select the member checkbox.
From the Toolbar, click Revert -> Revert Single Member.
Grid Manager displays a message indicating that the revert process disrupts Grid services. Read the message carefully, and then click Yes to confirm your decision to revert the member. Be aware that when you revert a member, some changes made since the member was last upgraded may get lost.
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