It depends on your storage system.
When your nodes storage are shared, the snapshots are available in front-end. Otherwise, you will need to take a look at the node where the VMs is running.
Let say I have this storage using GlusterFS. This storage are shared between nodes and front-end.
So all disk snapshot are available in front-end.
It located at
oneadmin@one-frontend ~ # tree /var/lib/one/datastores/100/1810/ /var/lib/one/datastores/100/1810/ ├── deployment.0 ├── disk.0 ├── disk.0.snap │ ├── 0 │ ├── 1 │ └── 2 └── disk.1 1 directory, 6 files
disk.0.snap is the directory where snapshot file stored. I have three snapshot files, as well as shown at Sunstone.
And it's have a same size because I repeat snapshotting without make any change in VM.
oneadmin@one-frontend ~ # du -h /var/lib/one/datastores/100/1810/disk.0.snap/* /var/lib/one/datastores/100/1810/disk.0 2.1G /var/lib/one/datastores/100/1810/disk.0.snap/0 2.1G /var/lib/one/datastores/100/1810/disk.0.snap/1 2.1G /var/lib/one/datastores/100/1810/disk.0.snap/2 1.5G /var/lib/one/datastores/100/1810/disk.0