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Update mdadm page. How to configure Fault LED to report error.

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Gauthier Provost 2018-11-29 19:08:40 +08:00
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docs/mdadm.md
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@ -326,22 +326,84 @@ Edit the following section and replace root by your email address.
!!! important
You will need to install and configure **postfix** or **sendmail**.
### Configure Error LED
### Configure Fault LED
!!! note
To be done.
Make the Red Fault LED (LED2) indicates if an error has been detected on your array. The below script will light up the LED2 if an error occurs on an array, and make LED2 blink during reconstruction of a degraded array.
First create the script *mdadm-fault-led.sh*
sudo nano /usr/sbin/mdadm-fault-led.sh
Copy the following script.
```bash
#!/bin/bash
#
# Make Red Fault LED (LED2) reports mdadm error events.
#
EVENT=$1
# RED Fault LED trigger
# trigger none = LED not-blinking if LED on
# trigger timer = LED blinking if LED on
TRIGGER=/sys/class/leds/helios4\:red\:fault/trigger
# RED Fault LED brightness
# britghness 0 = LED off
# britghness 1 = LED on
BRIGHTNESS=/sys/class/leds/helios4\:red\:fault/brightness
# Active component device of an array has been marked as faulty OR A newly noticed array appears to be degraded.
if [[ $EVENT == "Fail" || $EVENT == "DegradedArray" ]]; then
echo none > $TRIGGER
echo 1 > $BRIGHTNESS
fi
# An md array started reconstruction
if [ $EVENT == "RebuildStarted" ]; then
echo timer > $TRIGGER
echo 1 > $BRIGHTNESS
fi
# A spare component device which was being rebuilt to replace a faulty device has been successfully rebuilt and has been made active
if [ $EVENT == "SpareActive" ]; then
echo none > $TRIGGER
echo 0 > $BRIGHTNESS
fi
# Test RED Fault LED
if [ $EVENT == "TestMessage" ]; then
echo timer > $TRIGGER
echo 1 > $BRIGHTNESS
sleep 5
echo 0 > $BRIGHTNESS
fi
```
Make the script executable.
sudo chmod a+x /usr/sbin/mdadm-fault-led.sh
Edit mdadm configuration
sudo nano /etc/mdadm/mdadm.conf
and add the following section.
# trigger program when an event detected
PROGRAM /usr/sbin/mdadm-fault-led.sh
Restart mdmonitor service.
sudo systemctl restart mdmonitor.service
### Test alerts
You can test your error notification setup by doing the following:
`sudo systemctl stop mdmonitor.service`
`sudo mdadm --monitor --scan --test -1`
`sudo systemctl start mdmonitor.service`
## Import an Existing RAID Array
If for some reasons you want to add an existing array to your system (e.g you just did a new fresh install of your operating system), you can use the following command to detect your existing array.