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Difference between revisions of "Btrfs"
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= | = Volume management [https://btrfs.readthedocs.io/en/latest/Volume-management.html ⇒] = | ||
A pool of raw storage. Consists of one or more devices. The size of the volume will be the addition of all included devices, unless you use RAID. | A volume is a pool of raw storage. Consists of one or more devices. The size of the volume will be the addition of all included devices, unless you use RAID. | ||
If you do use more then one device, please also read the section about RAID. You are able to add/remove devices at any time to increase/decrease the size of the volume. With adding/removing devices it is also possible to move a volume from one device to another (without changing the UUID). | If you do use more then one device, please also read the section about RAID. You are able to add/remove devices at any time to increase/decrease the size of the volume. With adding/removing devices it is also possible to move a volume from one device to another (without changing the UUID). | ||
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A snapshot looks nearly the same as a subvolume. But snapshots really are "read-only photographs of a subvolume". While the subvolume changes with time. The snapshot is frozen in the state of the subvolume at the time you made it. | A snapshot looks nearly the same as a subvolume. But snapshots really are "read-only photographs of a subvolume". While the subvolume changes with time. The snapshot is frozen in the state of the subvolume at the time you made it. | ||
A snapshot is read-only. Therefore it is guaranteed not to change. In a snapshot you will find all files of the subvolume frozen in time. {{BoxWarning|Where to place snapshots|When creating snapshots you have to watch out for the volume layout in use}} | A snapshot is read-only. Therefore it is guaranteed not to change. In a snapshot you will find all files of the subvolume frozen in time. A snapshot is not a substitute for a backup! {{BoxWarning|Where to place snapshots|When creating snapshots you have to watch out for the volume layout in use}} | ||
Snapshots (if regularly made) may be used for: | Snapshots (if regularly made) may be used for: | ||