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About Snapshots
A virtual machine (VM) snapshot is a record of a running VM at a point in time. When you take a snapshot of a VM, its storage information (the data on the hard drive) and metadata (configuration information) is also saved. Where necessary, I/O on the VM temporarily halts while you take the snapshot to ensure that the snapshot captures a self-consistent disk image.
You can create snapshots without first shutting down the VM. This behavior is different to VM exports. A snapshot is similar to a normal VM template but it contains all the storage and configuration information for the original VM, including networking information. Snapshots provide a fast way of creating templates to export for backup purposes and then restore, or to use to quickly create VMs.
Snapshots are supported on all storage types.
Types of snapshots
XenCenter supports the following types of VM snapshot:
- disk-only
- disk and memory
Note:
In Citrix Hypervisor 8.0 and earlier versions, quiesced snapshots are also supported.
For more information, see Take a VM Snapshot.
Disk-only snapshots
Disk-only snapshots store a VM’s configuration information (metadata) and disks (storage), allowing them to be exported and restored for backup purposes. This type of snapshot is crash-consistent and can be performed on all VM types, including Linux VMs.
Disk and memory snapshots
In addition to saving the VM’s metadata and disks, disk and memory snapshots also save the VM’s memory state (RAM). Reverting to a disk and memory snapshot does not require a reboot of the VM, and VMs can be running or suspended when the snapshot is taken. Disk and memory snapshots can be useful in the following cases:
- If you are upgrading or patching software
- If you want to test a new application, but also want the option to be able to get back to the current, pre-change state (RAM) of the VM
Accessing orphaned snapshots
If you take snapshots of a VM and later delete the original VM, you can still access those snapshots in the Resources pane. Switch to Objects view in the Navigation pane and then expand the Snapshots group to see all available snapshots.
Related documentation
XenServer 8
Citrix Hypervisor 8.2 Cumulative Update 1
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