From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Scobie <richard@sauce.co.nz>
Subject: Re: raid5 - which disk failed ?
Date: Mon, 24 Sep 2007 12:11:52 +1200
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Rainer Fuegenstein wrote:

> 
> 1) when md starts a resync of the array, shouldn't one drive be marked
> as down [_UUU] in mdstat instead of reporting it as [UUUU] ? or, the
> other way round: is hde really the faulty drive ? how can I make sure
> I'm removing and replacing the proper drive ?

If it is not already, install smartmontools.

It certainly looks like hde is failing, so a smartctl -a /dev/hde should 
give you some idea. You will find it also gives you the serial number of 
the drive, which will be attached to a label on the drive, allowing you 
to locate it.

Regards,

Richard