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Date: Tue, 19 Nov 2013 10:56:59 +1030
From: Shane Ambler <FreeBSD@ShaneWare.Biz>
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To: aurfalien <aurfalien@gmail.com>, 
 FreeBSD Questions <freebsd-questions@freebsd.org>
Subject: Re: drive blink on demand?
References: <959063E8-FD7A-43C1-B0D7-B241F487E4BD@gmail.com>
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On 19/11/2013 08:39, aurfalien wrote:
> Hi,
> 
> I've 42 disks across 4 JBODs using LSI HBAs.
> 
> I've been doing dd if=/dev/disk... of=/dev/null and watching what
> rapidly blinks to identify drives.
> 
> However is there a better or at least non janky way to do this?

I've never had a drive enclosure to explore this but look at
ls /dev/led
and
man led