From owner-freebsd-fs@FreeBSD.ORG Tue Dec 9 02:27:28 2014 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id A8B45D9B for ; Tue, 9 Dec 2014 02:27:28 +0000 (UTC) Received: from fs.denninger.net (wsip-70-169-168-7.pn.at.cox.net [70.169.168.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "NewFS.denninger.net", Issuer "NewFS.denninger.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 62E7187D for ; Tue, 9 Dec 2014 02:27:27 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) by fs.denninger.net (8.14.9/8.14.8) with ESMTP id sB92Go9m003870 for ; Mon, 8 Dec 2014 20:16:51 -0600 (CST) (envelope-from karl@denninger.net) Received: from [127.0.0.1] (TLS/SSL) [70.165.30.124] by Spamblock-sys (LOCAL/AUTH); Mon Dec 8 20:16:51 2014 Content-Type: text/plain; charset="iso-8859-1" MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Mailer: BlackBerry Email (10.3.1.1154) Message-ID: <20141209021651.4304976.79605.2556@denninger.net> Date: Mon, 08 Dec 2014 20:16:51 -0600 Subject: Re: ZFS scrub on new disks gives cksum errors From: Karl Denninger In-Reply-To: <20141209021042.GA649@iozz.us> References: <20141208155230.GA574@iozz.us> <5485CB35.5010608@multiplay.co.uk> <20141209021042.GA649@iozz.us> To: freebsd-fs X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 09 Dec 2014 02:27:28 -0000 Stepped-wave ups power is perfectly fine to feed a switching power supply -= - in fact most run COOLER on it than on sine wave power! --=A0Karl (On=A0Passport=A0PDA) =A0 Original Message =A0 From: Brian N Sent: Monday, December 8, 2014 20:11 To: Sean Chittenden Cc: freebsd-fs@freebsd.org Subject: Re: ZFS scrub on new disks gives cksum errors On Mon, Dec 08, 2014 at 09:09:51AM -0800, Sean Chittenden wrote: > I had this exact problem at home on my FreeNAS host when a box is plugged > in to residential power that is "not clean." If you plug this host in to a > UPS it should clear things up instantly (find a sine wave UPS, not a > digital stepping supply). There's something about the fluctuating power or > brownouts that ZFS is well suited to detecting (and became terrifying to = me > because wtf happened in the past pre-ZFS??). >=20 > -sc Interesting. I have a UPS (APC Back-UPS ES 550 (stepped)) on the same circu= it (residential power) that routinely gives me power outage messages where an outage lasts 1-2 seconds. Other electrical devices (lights, etc) are not affected and I just thought that the UPS was very sensitive. Thanks for the reply. _______________________________________________ freebsd-fs@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-fs To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" %SPAMBLOCK-SYS: Matched [@freebsd.org+], message ok