From owner-freebsd-stable@FreeBSD.ORG Mon Dec 22 14:26:53 2014 Return-Path: Delivered-To: freebsd-stable@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 2AADE1A3 for ; Mon, 22 Dec 2014 14:26:53 +0000 (UTC) Received: from mail-wi0-f179.google.com (mail-wi0-f179.google.com [209.85.212.179]) (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 B275E6485A for ; Mon, 22 Dec 2014 14:26:52 +0000 (UTC) Received: by mail-wi0-f179.google.com with SMTP id ex7so8125743wid.0 for ; Mon, 22 Dec 2014 06:26:44 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:message-id:date:from:user-agent:mime-version:to :subject:references:in-reply-to:content-type :content-transfer-encoding; bh=q/zQuTvd5Nyl7h2WKLSUstnpJtiwJu+G0dP30NCuH1Q=; b=lQYDVjeTP+N/QNb+kq0Sl5Jdjj3BR61om4corDbi0UrIn7mLQXVPYQcJVQXpOFr/Xm C52cSM43HlNQET848YmCpm0M1n/Roy+XycPbtCKDBuXZchfx4yOCudvOhsxrMmwxaF9q PedtJqQAmN85/Yw0mawiGVUoJZt+BLOFgti4ud1TatigZncwsqx2GCbk7JJ7vqipVVOh RnXwctVoMkXn2Bh1L1f/edj25KOZkW2eKkU5V2xmv0QRLHKeMCoijAJ4kPkv1Gz8WfH/ 8qVHqxhqgk3ott6mVnaTtTr7g0BiiPsU/ERS+Ox6mxMtCstQyX23defyZEuBfd32tXxv DX+Q== X-Gm-Message-State: ALoCoQkkLu1coElwYc5lh13YMg1BQut6WcUi2BQxBW0Bo8iuB3rzIGcOJhGorGLVANNR6cgPFgtm X-Received: by 10.180.91.109 with SMTP id cd13mr31505471wib.46.1419258404801; Mon, 22 Dec 2014 06:26:44 -0800 (PST) Received: from [10.10.1.68] (82-69-141-170.dsl.in-addr.zen.co.uk. [82.69.141.170]) by mx.google.com with ESMTPSA id t4sm23896333wjy.21.2014.12.22.06.26.43 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 22 Dec 2014 06:26:43 -0800 (PST) Message-ID: <54982A08.0@multiplay.co.uk> Date: Mon, 22 Dec 2014 14:26:16 +0000 From: Steven Hartland User-Agent: Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: freebsd-stable@freebsd.org Subject: Re: 10.1 RC4 r273903 - zpool scrub on ssd mirror - ahci command timeout References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Dec 2014 14:26:53 -0000 On 22/12/2014 14:09, Peter HEINER wrote: >> So I now think the whole problem centers around the Samsung 850 PRO >> 512GB SSDs. Too bad I do not have the budget to just buy two Intel (or >> other) SSDs of similar size and see if the timeouts disappear.. >> >> I wonder if this is a firmware issue with the drive or just some >> misguided fancy energy saving feature of this particular drive >> model causing the whole trouble. > I don't think it's the SSDs, as I'm seeing the exact same behaviour > using 4 2TB WD Reds in a raidz1 with 10.1-RELEASE on a HP N40L as well. > Whenever I do heavy reads like a scrub or send, there are CAM timeouts > and eventually the drives detach. I had to downgrade to 10.0-RELEASE, > which seems to work fine so far. The box ran Ubuntu until recently, > without issues. > I am happy to troubleshoot further, should anyone want to pick this up. > I'm relatively new to FreeBSD, so any guidance on next steps to take is > welcome. Are all the disks your seeing errors with running at 6Gbps? If so have you tried downgrading the connection to SATA 2 speeds to see if that makes a difference? An example of this which goes in /boot/loader.conf is: hint.ahcich.0.sata_rev="2" We had a similar problem with a Dell chassis where the connection via the Hotswap backplane wasn't up to scratch for SATA 3 speeds, and this fixed it. Regards Steve