From owner-freebsd-questions@freebsd.org Mon Aug 17 18:05:19 2015 Return-Path: Delivered-To: freebsd-questions@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 8E1459BB03C for ; Mon, 17 Aug 2015 18:05:19 +0000 (UTC) (envelope-from paul@pk1048.com) Received: from cpanel61.fastdnsservers.com (server61.fastdnsservers.com [216.51.232.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 6F30415EF for ; Mon, 17 Aug 2015 18:05:18 +0000 (UTC) (envelope-from paul@pk1048.com) Received: from mobile-107-107-57-210.mycingular.net ([107.107.57.210]:62951 helo=[172.20.10.2]) by cpanel61.fastdnsservers.com with esmtpsa (TLSv1:AES128-SHA:128) (Exim 4.85) (envelope-from ) id 1ZROmW-003Arw-U3; Mon, 17 Aug 2015 13:05:13 -0500 Subject: Re: Quick Hard Drive Error Question Mime-Version: 1.0 (Mac OS X Mail 7.3 \(1878.6\)) Content-Type: text/plain; charset=windows-1252 From: PK1048 In-Reply-To: <46e87057b2ac9672e581dcd794bf1111@dweimer.net> Date: Mon, 17 Aug 2015 14:05:08 -0400 Cc: FreeBSD Questions Content-Transfer-Encoding: quoted-printable Message-Id: <6E95ACB0-EB0A-471E-9815-7B791DC25F67@pk1048.com> References: <46e87057b2ac9672e581dcd794bf1111@dweimer.net> To: dweimer@dweimer.net X-Mailer: Apple Mail (2.1878.6) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - cpanel61.fastdnsservers.com X-AntiAbuse: Original Domain - freebsd.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - pk1048.com X-Get-Message-Sender-Via: cpanel61.fastdnsservers.com: authenticated_id: info@pk1048.com X-Source: X-Source-Args: X-Source-Dir: X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 17 Aug 2015 18:05:19 -0000 On Aug 17, 2015, at 8:56, dweimer wrote: > I have an external SATA drive dock that I use to write backups to, I = have steadily been getting more parity/CRC errors over the last couple = of weeks. >=20 > Aug 17 00:14:14 freebsd kernel: (ada4:ahcich5:0:0:0): = WRITE_FPDMA_QUEUED. ACB: 61 00 70 e7 53 40 85 00 00 01 00 00 > Aug 17 00:14:14 freebsd kernel: (ada4:ahcich5:0:0:0): CAM status: = Uncorrectable parity/CRC error > Aug 17 00:14:14 freebsd kernel: (ada4:ahcich5:0:0:0): Retrying command > Aug 17 00:14:14 freebsd kernel: (ada4:ahcich5:0:0:0): = READ_FPDMA_QUEUED. ACB: 60 70 d0 c6 1c 40 84 00 00 00 00 00 > Aug 17 00:14:14 freebsd kernel: (ada4:ahcich5:0:0:0): CAM status: = Uncorrectable parity/CRC error > Aug 17 00:14:14 freebsd kernel: (ada4:ahcich5:0:0:0): Retrying command >=20 > I have ran smart tests on the drives, they report no errors, hers the = most recent summary line from the currently mounted drive. Are there any port multipliers involved ? When I had 4 SATA drives = behind a port multiplier I had these type of errors frequently under = high load. I was using ZFS so dialed back the outstanding queue depth = from 10 to 2 to reduce load and the errors went away. I have since gone = to one port per drive (and went back to the default queue depth of 10) = and have not had the problem recur=85 But, I have seen a =93finicky-ness=94 between eSATA ports and cables. = Certain cables work on certain ports but not on others. Have you tried = substituting the eSATA cable ? A different eSATA port perhaps ?