[geeks] Murphy, instantiated

[Jonathan Groll]

On Tue, Jun 02, 2009 at 09:37:44AM -0400, Phil Stracchino wrote:
>Jonathan Groll wrote:
>Two identical controllers, 12 disks.  I don't think it's a simple write
>corruption issue, because the three failed disks didn't even come back
>up on the bus after reboot.  They're dead as doornails.
>
So, the odds of all three disks failing on one controller are:
1/2 * 1/2 * 1/2 = 1/8 

or 1 in 4 that all three failed disks will belong to the same
controller!

At the very least, it is worthwhile decommisioning the 'bad'
controller (wouldn't trust it), and trying the 'failed' disks in
another box altogether...

Cheers,
Jonathan