From owner-freebsd-questions@FreeBSD.ORG  Tue Nov  4 16:57:59 2014
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115])
 (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
 (No client certificate requested)
 by hub.freebsd.org (Postfix) with ESMTPS id 9BEE375D
 for <freebsd-questions@freebsd.org>; Tue,  4 Nov 2014 16:57:59 +0000 (UTC)
Received: from mail-qg0-x22e.google.com (mail-qg0-x22e.google.com
 [IPv6:2607:f8b0:400d:c04::22e])
 (using TLSv1 with cipher ECDHE-RSA-RC4-SHA (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 5C25EDCB
 for <freebsd-questions@freebsd.org>; Tue,  4 Nov 2014 16:57:59 +0000 (UTC)
Received: by mail-qg0-f46.google.com with SMTP id i50so9666454qgf.5
 for <freebsd-questions@freebsd.org>; Tue, 04 Nov 2014 08:57:58 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=from:user-agent:mime-version:content-transfer-encoding:content-type
 :subject:date:to:message-id;
 bh=6BSkzragGoUxnWRZb5wQhElWcEYZbi7qONyN1F4k9Co=;
 b=TtWC6DokPtMptDi2ABE9cLOlPkydmfhez2w5cvKXUDraPOAvl0yVENjyXNcHLUXP0q
 zTiyYQGz4KF33c8lI1toJeAZ+ON0Z7O2DnIGIPWOrpmqJqwmFhiqzKy+br7fSWxDURQY
 zRWuccrfXT15SVZnM3sKpIRi6yJWigws0zwqIEEHV5Jt99Re9alcn5A0jg8vZugGdvfO
 /2andn1FoIpsDRPaeKjI0MiYFtX04CVxC4fScfhJfIVeDz4cG4qQL8yvTUSznosMZ4Zl
 qG5a7V3mmmFUdg2JleOCeR5KqhTGmD1QVOX2XMbc0Tr20264WNVjTfciCYLgLDgL8ayK
 hMUA==
X-Received: by 10.224.92.81 with SMTP id q17mr36716138qam.66.1415120277941;
 Tue, 04 Nov 2014 08:57:57 -0800 (PST)
Received: from cyanogenmod.home (pool-71-185-80-109.phlapa.fios.verizon.net.
 [71.185.80.109])
 by mx.google.com with ESMTPSA id v4sm810068qag.23.2014.11.04.08.57.57
 for <freebsd-questions@freebsd.org>
 (version=TLSv1.2 cipher=ECDHE-RSA-RC4-SHA bits=128/128);
 Tue, 04 Nov 2014 08:57:57 -0800 (PST)
From: Stephen R Guglielmo <srguglielmo@gmail.com>
X-Google-Original-From: Stephen R Guglielmo <SRGuglielmo@gmail.com>
User-Agent: K-9 Mail for Android
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain;
 charset=UTF-8
Subject: ZFS RaidZ - Only One HDD Light Active
Date: Tue, 04 Nov 2014 11:57:55 -0500
To: freebsd-questions@freebsd.org
Message-ID: <34EE252D-09FE-4FF2-94BF-B11726118336@gmail.com>
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.18-1
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions/>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
 <mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 04 Nov 2014 16:57:59 -0000

Hi list,

I have a system that is running ZFS on root with raidZ across 4 disks. While sorting out another problem, I had the cover off on my server and noticed that only a single HDD activity light is lighting up. Only disk #3, none of the other drives seem to be showing any activity. I've been scrubbing the zpool for a few hours now and didn't notice any other lights lighting up.

The system is a HP ProLiant with SATA disks. I was wondering if this seemed strange to anyone else.

-Steve