Undoable - The disk appears to operate normally, but when the virtual machine is powered off, you choose whether to make changes to the disk permanent or discard them.Īppend - The disk appears to operate normally, but disk changes are kept separate from the original values.
Nonpersistent - The disk appears to operate normally while the virtual machine is powered on, but when it is powered off, the disk contents revert to the original contents. Changes are immediately and permanently written to the disk. On legacy virtual machines, the following disk modes are possible: Some of the functions of snapshots were provided on a per-disk basis by a richer set of disk modes. Versions of ESX earlier than 3.0 do not provide snapshots. Nonpersistent - The disk appears to operate normally, but whenever the virtual machine is powered off or reverted to a snapshot, the contents of the disk return to their original state (all later changes are discarded). Persistent - The disk operates normally except that changes to the disk are permanent even if the virtual machine is reverted to a snapshot. For some purposes, you might make a disk independent of the snapshot mechanism, so that snapshot operations do not affect the disk contents. Normally, the disk functions as it would in a physical machine, with changes written to the disk controlled by the snapshot mechanism. With snapshots, the Disk Mode describes how the virtual hard disk participates in snapshots. ESX 3 provides full virtual machine snapshotting.
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