On Thu, Oct 30, 2008 at 12:18, Dexter Filmore [off-list ref] wrote:

Am Donnerstag, 30. Oktober 2008 17:47:31 schrieb Chris Green:

quoted

cp /dev/md0 /dev/null

And then look at which drive's light isn't on.

Thing is they don't have individual lights, they're just sitting in the tower,
no backplane or such.

tar md0's contents, pipe into /dev/null, and use a stethoscope to find
the one drive that's not clicking wildly?

Seriously.  Getting the serial number with smartctl or hdparm, and
searching through the disks for that SN while the machine is offline
is probably the safest route if you aren't absolutely certain which
drives are where.  With anything less certain than the serial number,
there's noteable chance you could pick wrong.  Depending on what raid
level is used, and how failed it is, you might not have the liberty of
a second try if you pull the wrong drive with the array in use.