5 Freezing and Unfreezing an XFS File System
Use the xfs_freeze command to stop write operations when taking hardware-based snapshots of an XFS file system.
Note:
You don't need to explicitly suspend write operations if you use the
lvcreate command to take an LVM snapshot.
You can also use the xfs_freeze command with btrfs,
ext3, and ext4 file systems.
For more information, see the xfs_freeze(8) manual page.