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Create LVM rollback snapshots

Create LVM rollback snapshots: Linux System Engineer: Advanced Disk Systems and System Backup
Create LVM rollback snapshots: Linux System Engineer: Advanced Disk Systems and System Backup

Rollback snapshots allow us to roll our system back to the state it was in before the file system was modified. This works really well for system updates. If the update does not go well, we can roll back to the pre-update state. In order to do rollback snapshots of the root file system, however, a reboot is in order because the volume needs to be deactivated and reactivated. In order to be deactivated, we need to unmount it and we can't unmount the root file system while we're using it.

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