20.13.8 Creating Snapshots of the root File System

The software described in this documentation is either in Extended Support or Sustaining Support. See https://www.oracle.com/us/support/library/enterprise-linux-support-policies-069172.pdf for more information.
Oracle recommends that you upgrade the software described by this documentation as soon as possible.

20.13.8 Creating Snapshots of the root File System

To take a snapshot of the current root file system:

Mount the top level of the root file system on a suitable mount point.
```
# mount -o subvolid=5 /dev/mapper/vg_btrfs-lv_root /mnt
```
Change directory to the mount point and take the snapshot. In this example, the install subvolume is currently mounted as the root file system system.
```
# cd /mnt
# btrfs subvolume snapshot install root_snapshot_1
Create a snapshot of 'install' in './root_snapshot_1'
```
Change directory to / and unmount the top level of the file system.
```
# cd /
# umount /mnt 
```
The list of subvolumes now includes the newly created snapshot.
```
# btrfs subvolume list / 
ID 258 top level 5 path install
ID 260 top level 5 path root_snapshot_1
```