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@ -115,7 +115,7 @@ start with one of the following option sets. |
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\f[C]mergerfs -o cache.files=partial,dropcacheonclose=true,category.create=mfs /mnt/hdd0:/mnt/hdd1 /media\f[R] |
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.SS /etc/fstab |
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.PP |
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\f[C]/mnt/hdd0:/mnt/hdd1 /media fuse.mergerfs cache.files=partial,dropcacheonclose=true,category.create=mfs 0 0\f[R] |
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\f[C]/mnt/hdd0:/mnt/hdd1 /media mergerfs cache.files=partial,dropcacheonclose=true,category.create=mfs 0 0\f[R] |
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.SS systemd mount |
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.PP |
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https://github.com/trapexit/mergerfs/wiki/systemd |
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@ -517,7 +517,7 @@ tools use \f[B]/etc/fstab\f[R]. |
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.nf |
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\f[C] |
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# <file system> <mount point> <type> <options> <dump> <pass> |
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/mnt/hdd*:/mnt/ssd /media fuse.mergerfs minfreespace=16G 0 0 |
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/mnt/hdd*:/mnt/ssd /media mergerfs minfreespace=16G 0 0 |
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\f[R] |
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.fi |
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.PP |
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@ -847,20 +847,12 @@ In theory this flag should not be exposed to the end user. |
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It is a low-level FUSE flag which indicates whether or not the kernel |
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can send certain kinds of messages to it for the purposes of using with |
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NFS. |
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mergerfs does support these messages but due to a possible bug in the |
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Linux kernel this option needs to be configurable. |
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As it turns out at least certain versions of NFS can still work when |
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disabled and no longer triggers the bug. |
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.PP |
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While it may be safe to default this setting to \f[C]false\f[R] in an |
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abundance of caution it is being left enabled by default. |
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mergerfs does support these messages but due bugs and quirks found in |
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the kernel and mergerfs this option is provided just in case it is |
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needed for debugging. |
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.PP |
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Given that this flag is set when the FUSE connection is first initiated |
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it is not possible to change during run time. |
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.PP |
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See Kernel Issues & |
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Bugs (https://github.com/trapexit/mergerfs/wiki/Kernel-Issues-&-Bugs) |
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for more details. |
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.SH FUNCTIONS, CATEGORIES and POLICIES |
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.PP |
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The POSIX filesystem API is made up of a number of functions. |
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@ -1577,8 +1569,8 @@ apply those before mounting the new version. |
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\f[C] |
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$ sudo mount /mnt/mergerfs |
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$ mount | grep mergerfs |
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media on /mnt/mergerfs type fuse.mergerfs (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other) |
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media on /mnt/mergerfs type fuse.mergerfs (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other) |
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media on /mnt/mergerfs type mergerfs (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other) |
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media on /mnt/mergerfs type mergerfs (rw,relatime,user_id=0,group_id=0,default_permissions,allow_other) |
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\f[R] |
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.fi |
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.PP |
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@ -2588,11 +2580,13 @@ It should be noted that NFS and FUSE (the technology mergerfs uses) do |
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not work perfectly with one another due to certain design choices in |
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FUSE (and mergerfs.) Due to these issues it is generally recommended to |
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use SMB when possible till situations change. |
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That said issues should still be reported. |
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NFS is not really recommended but it isn\[cq]t unsupported. |
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That said mergerfs should generally work as an export of NFS and issues |
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discovered should still be reported. |
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.PP |
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To ensure compatibility between mergerfs and NFS use the following |
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settings. |
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.PP |
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mergerfs settings: * noforget * inodecalc=path-hash * |
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export-support=false (only available in v2.40.0 and above) |
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mergerfs settings: * noforget * inodecalc=path-hash |
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.PP |
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NFS export settings: * fsid=UUID * no_root_squash |
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.PP |
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@ -2618,35 +2612,17 @@ mergerfs will use will be on a different branch and therefore the inode |
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would change. |
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This isn\[cq]t an ideal solution and others are being considered but it |
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works for most situations. |
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It might be possible to leave the default value of \f[C]hybrid-hash\f[R] |
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if \f[C]export-support=false\f[R] but it hasn\[cq]t been fully tested |
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yet. |
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.PP |
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\f[C]export-support=false\f[R] is a low-level FUSE option that is needed |
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as a workaround to a Linux kernel bug. |
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Technically this option should be set to \f[C]true\f[R] when expecting |
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to use mergerfs with NFS but it turns out that at least some versions of |
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NFS work when not enabled. |
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At the moment it is unclear if this has any negative side effects but |
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when disabled NFS appears to work alright and the kernel no longer sends |
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invalid requests. |
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When the issue is resolved in the kernel these docs will be updated with |
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appropriate details. |
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.PP |
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Also see Kernel Issues & |
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Bugs (https://github.com/trapexit/mergerfs/wiki/Kernel-Issues-&-Bugs) |
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for more details. |
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.PP |
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\f[C]fsid=UUID\f[R] is needed because FUSE filesystems don\[cq]t have |
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different \f[C]st_dev\f[R] values which can cause issues when exporting. |
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The easiest thing to do is set each mergerfs export \f[C]fsid\f[R] to |
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some random value. |
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An easy way to generate a random value is to use the command line tool |
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\f[C]uuidgen\f[R] or through a website such as |
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\f[C]uuid\f[R] or \f[C]uuidgen\f[R] or through a website such as |
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uuidgenerator.net (https://www.uuidgenerator.net/). |
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.PP |
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\f[C]no_root_squash\f[R] is not strictly necessary but can lead to |
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confusing permission and ownership issues. |
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confusing permission and ownership issues if root squashing is enabled. |
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.SS SMB / CIFS |
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.PP |
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SMB (https://en.wikipedia.org/wiki/Server_Message_Block) is a protocol |
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Antonio SJ Musumeci
10 months ago