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Snapshots and Legacy Disk Modes
If you are familiar with the disk modes used in earlier versions of GSX Server, you can use the snapshot to achieve equivalent results. If you want the equivalent of:
Persistent mode Do not take a snapshot.
Undoable mode Take a snapshot when you begin your working session. To discard all work done during the session, revert to the snapshot. To commit the work done during the session, take a new snapshot at the end of the working session. To keep the work done during a session without committing it, leave the original snapshot unchanged.
Nonpersistent mode Be sure the virtual machine is in the state you want it. Power off the virtual machine. Take a snapshot. Go to VM > Settings > Options > Snapshot. Under When powering off select Revert to snapshot.
Note: In earlier versions of GSX Server, disk modes had to be set individually for each disk. The snapshot introduced in GSX Server 3 applies by default to the entire virtual machine, including all disks attached to the virtual machine.