I had a server with Layered Technologies. Raid 1 mirrored. A drive died. Server went off-line. They f**ked the other drive and formatted it...
Not the first time I've heard of that happening. I've also known of an instance where a tech tossed the good drive in the trash, installed a new drive, and then couldn't figure out why he couldn't create a new mirror set with the bad drive. Thank Buddah the good drive wasn't damaged or picked up by the trash guys before he figured out what he'd done.
RAID diagnostics report which drive has failed. That's why those multidrive bays have numbers on the slots. You'd think if the controller reported the drive in slot 1 failed, he'd look at the slot number rather than pull out the first
drive in the multibay - which is usually slot zero rather than 1.
Even dumber was when he got caught. Rather than acknowledge he made a fixable mistake he tried to lie his way out if it. Unfortunately, the manager he was "explaining" things to wasn't clueless about servers.
Which is how I found out about it. (And also got a new client in the process.)