You might want to try
smartctl -a /dev/sda it would report something like this among other things
Device Model: WDC WD3200YS-01PGB0
Serial Number: WD-WCAPD3169758
> -----Original Message-----
> From: centos-bounces@xxxxxxxxxx [mailto:centos-bounces@xxxxxxxxxx] On
> Behalf Of Joseph L. Casale
> Sent: Tuesday, September 20, 2011 7:11 AM
> To: 'CentOS mailing list'
> Subject: Re: mdadm and drive identification?
>
> >Is there another easy way I can positively ID a drive by serial number
and
> the /dev/sd[a-z] that mdadm sees?
>
> I don't know of a tool like tune2fs or *fstune that works for mdraid.
> You might try on the mdadm list where Neil Brown hangs out...
>
> Given the wealth of easy ways to manage and monitor the health of an lsi
> card, I'd never entertain this on any of my systems that use them...
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