Bash script for PRTG by Paessler to monitor an entire volume on your Synology NAS
nas_vol_info_b.sh is especially for btrfs filesystem as I have learned that df deals not correct with some of the quirks of btrfs. This script uses therefore btrfs filesystem usage to get the data.
Sensor has to be created in PRTG on your Synology device.
Sensor tested on DS 918+ with DSM 6.2.4-25556 and 7.0-41890
HINT: The value Used (%) may differ from what DSM tell you. Maybe DSM use also df.
Be sure you have set correct logon values for SSH in your device.
I personally use "Login via private key" with an user especially for monitoring which also may use sudo for this script without a password.
HINT: Since DSM 6.2.2 for SSH access the user has to be member of the local Administrators group on your Synology NAS.
Place the script to /var/prtg/scriptsxml on your Synology NAS and make it executable. (You may have to create this directory structure because PRTG expects the script here.)
wget https://raw.githubusercontent.com/WAdama/nas_vol_info/master/nas_vol_info.sh
or
wget https://raw.githubusercontent.com/WAdama/nas_vol_info/master/nas_vol_info_b.sh
chmod +x nas_vol_info.sh
In PRTG create under your device which represents your Synology a SSH custom advanced senor.
Choose under "Script" this script and enter under "Parameters" the name of the volume you want to monitor: e.g. volume1.
This script will set default values for limits in the Used (%) channel:
90% for Upper warning limit
95% for Upper error limit
Sensor nas_vol_info.sh:
Sensor nas_vol_info_b.sh:
