http://www.tuxyturvy.com/blog/index.php?/archives/69-Equallogic-Eats-Our-Data.html
Lessons learned
Have good backups! (This is true for anything)
Stick with RAID50
Update firmware (often but not too often, I aim to not be bleeding edge, but current)
Replace drives quickly
Support might not be useful, need to escalate to higher level quickly in an emergency somehow.