====== Systems - Media Server - Install Snapraid ======

**SnapRAID** is a backup program for disk arrays.

  * It stores parity information of the data and it recovers from up to six disk failures.
  * It is mainly targeted for a home media center, with a lot of big files that rarely change.

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===== Install SnapRaid =====

<code bash>
sudo apt install snapraid
</code>

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===== Determine the mountpoints in the system =====

<code bash>
df -h
</code>

returns:

<code>
Filesystem                        Size  Used Avail Use% Mounted on
/dev/nvme0n1p2              ext4      1.8T  1.7T   14G 100% /
...
/dev/sdb                    ext4       15T   14T  286G  98% /mnt/disk1
/dev/sdc                    ext4       15T   13T  1.5T  90% /mmt/disk2
/dev/sdd                    ext4       15T   14T   30G 100% /mnt/disk3
/dev/sde                    ext4       15T   14T  3.2G 100% /mnt/disk4
/dev/sdf                    ext4       15T   14T   56G 100% /mnt/parity1
/dev/sdg                    ext4       15T   14T  233G  99% /mnt/parity2
mergerfs                           34T   24T   10T  69% /mnt/media
</code>

<WRAP info>
**NOTE:**  This checks the mountpoints.
</WRAP>


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===== Configure SnapRAID =====

Edit the main configuration file for SnapRAID, **/etc/snapraid.conf**.

A basic configuration for three data disks and one parity disk looks like this:

<file bash /etc/snapraid.conf>
# Parity files - stored on the largest disks or dedicated parity drives.
1-parity /mnt/parity1/snapraid.parity
2-parity /mnt/parity2/snapraid.parity

# Content files - store metadata; should be on multiple drives for redundancy.
content /var/snapraid.content
content /mnt/disk1/.snapraid.content
content /mnt/disk2/.snapraid.content
content /mnt/disk3/.snapraid.content
content /mnt/disk4/.snapraid.content

# Data drives - these contain actual files.
data d1 /mnt/disk1
data d2 /mnt/disk2
data d3 /mnt/disk3
data d4 /mnt/disk4

# Excludes hidden files and directories
exclude *.unrecoverable
exclude /tmp/
exclude /lost+found/
exclude downloads/
exclude appdata/
exclude *.!sync
</file>

<WRAP info>
**NOTE:**  Modify this file depending on the disks in the system.
</WRAP>

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