From mboxrd@z Thu Jan  1 00:00:00 1970
From: Richard Scobie <richard@sauce.co.nz>
Subject: Re: problem growing raid-1
Date: Mon, 02 Feb 2009 07:56:48 +1300
Message-ID: <4985F070.10105@sauce.co.nz>
References: <6d344ffd0901312134q623be8ffi4cec4b6c39dd6216@mail.gmail.com>
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To: Troy Cauble <troycauble@gmail.com>
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Troy Cauble wrote:
> I want to replace both disks in a RAID-1 with larger ones using the
> instructions here:
> http://linux-raid.osdl.org/index.php/Growing#Extending_an_existing_RAID_array
> 
> It looks straightforward: mdadm -f, mdmadm -r, swap a drive, etc., etc.
> 
> Except if I -f & -r a drive, I won't know which physical drive to pull.
> (And I have no spare SATA ports.)

smartctl -a -d ata /dev/sdx

will tell you the serial number of the drive, which then lets you 
shutdown, identify and remove the correct one.

Regards,

Richard