The 2TB Lacie that failed on me was set up as RAID. However, that doesn't help when the thing won't come on and just sits and groans. I took it to an outfit that specializes in recovering HD data in event of failure. Had it not been RAID the fee was $900, but because it was RAID the fee was $1400. I am no longer a fan of RAID.[a href=\"index.php?act=findpost&pid=208432\"][{POST_SNAPBACK}][/a]
Ouch. Was that a 2TB unit arranged into a 1TB volume? If it was configured as 2TB then there'd be no redundancy (what the "R" in RAID stands for) and it would just be a big striped volume with more than twice the probability of failure.
It's important to be conscious of critical single points of failure (in your case the Lacie box was a closed unit: a drive dying shouldn't have been a problem for a mirrored setup, but the box/controller dying would be a problem).
My own RAID setups are either in a ReadyNAS where I can swap out faulty disks (or swap good disks into a replacement NAS) or with external JBODs configured into mirrors through the OS's built-in RAID.
Of course, RAID on your primary storage is usually there to just save you from outages when drives die and to preserve your data since the last backup. If you have regular backups in place (even just some cheaper USB2 1TB drives that have complete copies of the data and are rotated between on-site and off-site storage) then you'd only need HD recovery services for data since the last backup. At that point the $900-$1400 service might not have such a significant value to you. Backups can also save you from the errors that RAID doesn't protect against (e.g. human errors deleting files!).
I really like the Drobo unit I have, but I just object to getting ripped off by a Canadian distributor who is still pricing them as if the Cdn dollar was worth .75 cents US. I find it a bit slow at times, but unlike others I don't blame the fact that it's USB for this.
FWIW, the new model is USB+FW800 at the same price (at least here). But the price is still not cheap.