Daemon to verify Linux md raid

On Debian (and therefore Ubuntu) machines, cron runs:

/usr/share/mdadm/checkarray --cron --all --quiet

the first Sunday of the month. This does exactly what you want.

It basically boils down to:

# echo check > /sys/block/$array/md/sync_action

but with a lot of sanity around it. Steal it from your nearest Debian install, or from the mdadm source package.

From the the Linux Software Raid How To:

...basic example. Running:

mdadm --monitor --mail=root@localhost --delay=1800 /dev/md2

should release a mdadm daemon to monitor /dev/md2. The delay parameter means that polling will be done in intervals of 1800 seconds. Finally, critical events and fatal errors should be e-mailed to the system manager.