Greyhole
Greyhole is an application that uses Samba to create a storage pool of all your available hard drives (whatever their size, however they are connected), and allows you to create redundant copies of the files you store, in order to prevent data loss when part of your hardware fails.
Installation
Install the greyholeAUR package.
Configuration
1. Setup Samba
Edit /etc/samba/smb.conf and add the following 2 lines to the [global] section
unix extensions = no wide links = yes
For each of your shares, add a 'dfree command' and 'vfs objects' lines, as seen below.
Example share definition:
[share_name]
path = /path/to/share_name
create mask = 0770
directory mask = 0770
read only = no
available = yes
browseable = yes
writable = yes
guest ok = no
printable = no
dfree command = /usr/bin/greyhole-dfree
vfs objects = greyhole
Restart smb.service.
2. Setup and start MySQL as described in MariaDB.
3. Customize the greyhole configuration at /etc/greyhole.conf
4. For each directory you defined as 'storage_pool_directories', execute the following command, to create a hidden file in the root directory of each partition:
# touch <dir>/.greyhole_uses_this
Those files will be used to differentiate an empty mount from a now-gone mount. i.e. Greyhole will output a warning if this file is not in the root directory where it is about to try to save a file, and it will not use that directory. This will prevent Greyhole from filling the / partition when a partition is unmounted!
5. The following is needed to work around problems with the CIFS client. This can be added to your /etc/rc.local or you can add cifs to the modules section of rc.conf and use modprobe.d to set OplockEnabled.
# modprobe cifs # echo 0 > /proc/fs/cifs/OplockEnabled
6. Configure PHP
Open /etc/php/php.ini in your favorite editor.
Set date.timezone and uncomment extension=pdo_mysql.
7. Start greyhole.service.