Taking a snapshot of ISE virtual machines is not supported but it still happens occasionally due to administrators taking a snapshot manually or an integrated technology that automatically takes snapshots to back up VMs. When taking a snapshot of a live VM, the file system is quiesced which can lead to the ISE node becoming unresponsive or worse, corrupting it requiring a rebuild.
A configuration parameter can be added to each ISE VM to prevent a snapshot from being taken. See the attached document for the steps with screenshots or follow the steps below:
Before powering on the ISE VM for the first time, right-click the VM and click Edit Settings. If the VM is already powered on, you must shut it down to make changes.
Click the VM Options tab.
Click Advanced to expand it.
Scroll to the bottom and locate Configuration Parameters and click the Edit Configuration button.
Click the Add Configuration Params button.
Enter snapshot.maxSnapshots into the Name field and enter 0 into the Value field, then click OK.
Attempt to create a snapshot of the VM to test. The task should error out.
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