From owner-freebsd-hardware@freebsd.org Thu Aug 10 13:44:54 2017 Return-Path: Delivered-To: freebsd-hardware@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 36C33DD33FE; Thu, 10 Aug 2017 13:44:54 +0000 (UTC) (envelope-from ben.rubson@gmail.com) Received: from mail-wm0-x231.google.com (mail-wm0-x231.google.com [IPv6:2a00:1450:400c:c09::231]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id BE26A1687; Thu, 10 Aug 2017 13:44:53 +0000 (UTC) (envelope-from ben.rubson@gmail.com) Received: by mail-wm0-x231.google.com with SMTP id f15so22964428wmg.1; Thu, 10 Aug 2017 06:44:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=D+xEiEBYveIASKYA1Wjt8vh9UegHK2Qh2mqs7H5oWyQ=; b=aH8vBoKkRzSWzQJtkmYOLVy2qdqdRiu22dYB4Nwxh2hy7ta0HGOfrIjIVGRJnZzN2B w0C/aL4O/WcvjVrpCiXuj/lG7So6CmIphzP7ZwiVyIOk/iscW5MN444pb9AVIo7hbSGK Rvw7kmJwX3oZLebjIwR+pAtKJnBJnITxhoOMc2UiZSNB2TkkfdkODgp9bbx/JEqkQqGJ Q/ALFxnbv5xgbIu6VuuBy8dTg3JB/6GqzaNuLgd9wFjCXDJ+IvyzyxkSP8CO5VVKVa0D 9nP0MIJTMQES++0J79GHbOFKsk2HGo83q0FBi8h1n0lOnRM7QICjnI7xiKNOvsiJPaK2 od7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=D+xEiEBYveIASKYA1Wjt8vh9UegHK2Qh2mqs7H5oWyQ=; b=lGizENCQBgU0LsS0tf9W4neoOTz5RneyZXARRqphtuiopHFbHdE5We8/MTlutDO45u A0TSnTV9wFNfiioE6ihX9mFz7J+0B54X8DZYMajrSKXt+4wXDutQ5jEj5nOFBzJSPUK/ f54lUA2U3gXl+/yfPvnS3OaHe4PfTk5H4Ny9kRlZo5b+gySSxT29Rvz12X+EX2ak3gy8 ki8IH9MWkbvsinW0YB2ejVT7Dbe2WlywD89DPZiaG0ZCOfzuQhgnU+bCHz4KyFRjJtuq PAkHHvLV1AqneVDlyJmIsLFprWDapNId5p7v+OjFAMhTs7lrM051G4udRZ1I1tzDH8Wx Mrgg== X-Gm-Message-State: AHYfb5jislAGrR76HNYaCLsGhFN3iiGnDHPt0yDwf8qKR6pELgJThAts krYw67haJyyVxjGmkfE= X-Received: by 10.28.9.9 with SMTP id 9mr7457520wmj.93.1502372692020; Thu, 10 Aug 2017 06:44:52 -0700 (PDT) Received: from ben.home (LFbn-1-6951-179.w90-116.abo.wanadoo.fr. [90.116.132.179]) by smtp.gmail.com with ESMTPSA id 60sm4388472wrd.20.2017.08.10.06.44.51 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Thu, 10 Aug 2017 06:44:51 -0700 (PDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: Do I need SAS drives?.. From: Ben RUBSON In-Reply-To: Date: Thu, 10 Aug 2017 15:44:50 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: References: <4DFBCE11-913A-4FC9-937D-463B4D49816C@aldan.algebra.com> To: FreeBSD-scsi , freebsd-hardware@freebsd.org X-Mailer: Apple Mail (2.3124) X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Aug 2017 13:44:54 -0000 > On 09 Aug 2017, at 17:59, Alan Somers wrote: >=20 > 3) SAS drives have a lot of fancy features that you may not need or > care about. For example, (...) their error > reporting capabilities are more sophisticated than SMART Really interesting answer Alan, thank you very much ! Slightly off-topic but I take this opportunity, how do you check SAS drives health ? I personally cron a background long test every 2 weeks (using = smartmontools). I did not experience SAS drive error yet, so not sure how this behaves. Does the drive reports to FreeBSD when its read or write error rate = cross a threshold (so that we can replace it before it fails) ? Or perhaps smartd will do ? As an example below a SAS error counter log returned by smartctl : Errors Corrected by Total Correction Gigabytes = Total ECC rereads/ errors algorithm processed = uncorrected fast | delayed rewrites corrected invocations [10^9 bytes] = errors read: 0 49 0 49 233662 73743.588 = 0 write: 0 3 0 3 83996 9118.895 = 0 verify: 0 0 0 0 28712 0.000 = 0 Thank you ! Ben