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.