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28 lines
1.1 KiB
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28 lines
1.1 KiB
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Subvolumes and snapshots
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bcachefs supports subvolumes and snapshots with a similar userspace
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interface as btrfs. A new subvolume may be created empty, or it may be
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created as a snapshot of another subvolume. Snapshots are writeable and
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may be snapshotted again, creating a tree of snapshots.
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Snapshots are very cheap to create: they’re not based on cloning of COW
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btrees as with btrfs, but instead are based on versioning of individual
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keys in the btrees. Many thousands or millions of snapshots can be
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created, with the only limitation being disk space.
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The following subcommands exist for managing subvolumes and snapshots:
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- ``bcachefs subvolume create``: Create a new, empty subvolume
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- ``bcachefs subvolume destroy``: Delete an existing subvolume or
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snapshot
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- ``bcachefs subvolume snapshot``: Create a snapshot of an existing
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subvolume
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A subvolume can also be deleting with a normal rmdir after deleting all
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the contents, as with ``rm -rf``. Still to be implemented: read-only
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snapshots, recursive snapshot creation, and a method for recursively
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listing subvolumes.
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