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34 lines
1.7 KiB
Markdown
34 lines
1.7 KiB
Markdown
# Terminology
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* `disk`, `drive`, `disk drive`: A [physical data storage
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device](https://en.wikipedia.org/wiki/Disk_storage). Such as a hard
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drive or solid-state drive. Usually requires the use of a filesystem
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to be useful. mergerfs does not deal with disks.
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* `filesystem`: Lowlevel software which provides a way to organize data
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and provide access to said data in a standard way. A filesystem is a
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higher level abstraction that may or may not be stored on a
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disk. mergerfs deals exclusively with filesystems.
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* `path`: A location within a filesystem. mergerfs can work with any
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path within a filesystem and not simply the root.
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* `branch`: A base path used in a mergerfs pool. mergerfs can
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accommodate multiple paths pointing to the same filesystem.
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* `pool`: The mergerfs mount. The union of the branches. The instance
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of mergerfs. You can mount multiple mergerfs pools. Even with the
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same branches.
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* `relative path`: The path in the pool relative to the branch and
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mount. `foo/bar` is the relative path of mergerfs mount
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`/mnt/mergerfs/foo/bar`.
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* `function`: A filesystem call such as `open`, `unlink`, `create`,
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`getattr`, `rmdir`, etc. The requests your software make to the
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filesystem.
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* `category`: A collection of functions based on basic behavior
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(action, create, search).
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* `policy`: The algorithm used to select a file or files when
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performing a function.
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* `path preservation`: Aspect of some policies which includes checking
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the path for which a file would be created.
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* `out-of-band`:
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[out-of-band](https://en.wikipedia.org/wiki/Out-of-band) in our
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context refers to interacting with the underlying filesystem
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directly instead of going through mergerfs (or NFS or Samba).
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