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48 lines
2.7 KiB
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48 lines
2.7 KiB
Markdown
# Tips and Notes
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* The documentation is explicit, literal, and reasonably thorough. If
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a suspected feature is not mentioned it does not exist. Do not read
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into the wording. What is described is how it functions. If you feel
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like something is not explained sufficiently please [file a
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ticket.](https://github.com/trapexit/mergerfs/issues)
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* If a `libfuse` argument is not listed it probably shouldn't be used
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and are unsupported.
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* Ensure you're using the latest version. Especially before submitting
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bug reports.
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* Run mergerfs as `root`. mergerfs is designed and intended to be run
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as `root` and may exhibit incorrect behavior if run otherwise.
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* If you do not see some directories and files you expect, policies
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seem to skip branches, you get strange permission errors, etc. be
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sure the underlying filesystems' permissions are all the same. Use
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`mergerfs.fsck` to audit the filesystem for out of sync permissions.
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* If you still have permission issues be sure you are using POSIX ACL
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compliant filesystems. mergerfs doesn't generally make exceptions
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for FAT, NTFS, or other non-POSIX filesystem.
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* Unless using Linux v6.6 or above do **not** use `cache.files=off` if
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you expect applications (such as rtorrent) to use
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[mmap](http://linux.die.net/man/2/mmap). Enabling `dropcacheonclose`
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is recommended when `cache.files=auto-full`.
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* [Kodi](http://kodi.tv), [Plex](http://plex.tv),
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[Subsonic](http://subsonic.org), etc. can use directory
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[mtime](http://linux.die.net/man/2/stat) to more efficiently
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determine whether to scan for new content rather than simply
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performing a full scan. If using the default `getattr` policy of
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`ff` it's possible those programs will miss an update on account of
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it returning the first directory found's `stat` info and it is a
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later directory on another mount which had the `mtime` recently
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updated. To fix this you will want to set
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`func.getattr=newest`. Remember though that this is just `stat`. If
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the file is later `open`'ed or `unlink`'ed and the policy is
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different for those then a completely different file or directory
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could be acted on.
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* Some policies mixed with some functions may result in strange
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behaviors. Not that some of these behaviors and race conditions
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couldn't happen outside mergerfs but that they are far more
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likely to occur on account of the attempt to merge multiple sources
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of data which could be out of sync due to the different policies.
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* For consistency it's generally best to set `category` wide policies
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rather than individual `func`'s. This will help limit the
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confusion of tools such as
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[rsync](http://linux.die.net/man/1/rsync). However, the flexibility
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is there if needed.
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