Monitoring software disk RAID
From Tech-Wiki
How to monitor mac software disk raid 0.
Best app is $20 - http://www.mazadigital.com/support/raidmonitor/index.html
If you don't want to pay, cron this:
if [ `/usr/sbin/diskutil checkRAID | grep -c Online` -lt 3 ]; then /usr/sbin/diskutil checkRAID | mail -s 'RAID Problem!' email@address; fi
Test by running:
/usr/sbin/diskutil checkRAID