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content/blog/mergerfs.md

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+---
+title: "MergerFS"
+date: 2020-01-14T23:10:17-05:00
+draft: false
+images: []
+---
+
+[MergerFS](https://github.com/trapexit/mergerfs) is a great filesystem for an expandable storage system in a homelab. Mostly since it allows you to add disks one at a time without having to, for example, resilver a ZFS pool. MergerFS won't be as efficient as a filesystem that stripes your data across disks, but in the case of a disk failure the disks unaffected will still have part of the data.
+
+[Plenty](https://blog.linuxserver.io/2017/06/24/the-perfect-media-server-2017/) of other [people](https://www.teknophiles.com/2018/02/19/disk-pooling-in-linux-with-mergerfs/) described MergerFS, so I'll keep this post simple.
+
+First install MergerFS,
+
+```bash
+sudo apt install mergerfs
+```
+
+The way I have my drives in my homelab setup is to have `/mnt/data/N` where `N` is the number of the drive.
+
+Examples: `/mnt/data/1`, `/mnt/data/2`, `/mnt/data/3`
+
+This is mainly so that I can use wildcards to capture all the drives at once.
+
+Temporary mounting solution:
+
+```bash
+sudo mergerfs -o defaults,allow_other,use_ino,fsname=data /mnt/data/\* $HOME/data
+```
+
+Permanent solution (Edit `/etc/fstab`)
+
+```bash
+/mnt/data/* /home/user/data fuse.mergerfs defaults,allow_other,use_ino,fsname=data 0 0
+```
+
+Quick summary of options passed
+
+| Option      | Description                                                  |
+| ----------- | ------------------------------------------------------------ |
+| defaults    | Shortcut for atomic_o_trunc, auto_cache, big_writes, default_permissions, splice_move, splice_read, splice_write |
+| allow_other | Allows users beside the mergerfs owner to view the filesystem. |
+| use_ino     | MergerFS supplies inodes instead of libfuse                  |
+| fsname      | Name of the mount as shown in `df` and other tools           |
+