From owner-freebsd-questions@freebsd.org Fri Jan 22 16:25:22 2016 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 157BCA8CED5 for ; Fri, 22 Jan 2016 16:25:22 +0000 (UTC) (envelope-from mason@blisses.org) Received: from phlegethon.blisses.org (phlegethon.blisses.org [50.56.97.101]) (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 00B951501 for ; Fri, 22 Jan 2016 16:25:21 +0000 (UTC) (envelope-from mason@blisses.org) Received: from blisses.org (cocytus.blisses.org [23.25.209.73]) by phlegethon.blisses.org (Postfix) with ESMTPSA id 75F6B1493C3; Fri, 22 Jan 2016 11:25:18 -0500 (EST) Date: Fri, 22 Jan 2016 11:25:16 -0500 From: Mason Loring Bliss To: Priyadarshan Cc: freebsd-questions@freebsd.org Subject: Re: ZFS performance help sought Message-ID: <20160122162516.GR4538@blisses.org> References: <1453455663.2364898.499431058.4EA85780@webmail.messagingengine.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1453455663.2364898.499431058.4EA85780@webmail.messagingengine.com> User-Agent: Mutt/1.5.23 (2014-03-12) 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: Fri, 22 Jan 2016 16:25:22 -0000 On Fri, Jan 22, 2016 at 09:41:03AM +0000, Priyadarshan wrote: > Interestingly, we have moved one of our machines in the opposite > direction, from Linux 4.2/ZoL 0.6.5.4 to FreeBSD 10.2, because a 12 TB > pool under Linux/ZoL was consistently reporting errors every few weeks. The only reporting of errors I noted was when I was trying a persistent broken mirror for back-ups - I'd peel off a pool vdev and send it offsite, with the newly-onsite vdev being put back online. While ZFS was able to deal with this for a short time - maybe a day - it started spewing checksum errors if the vdev was brought back after a week, which is my normal rotation. This, however, was an issue with OpenZFS itself, and the problem was identical regardless of whether I was doing it under Linux or FreeBSD. I've since given up on the idea and I'm shipping self-contained pools offsite instead of pool elements. -- The creatures outside looked from pig to man, and from man to pig, and from pig to man again; but already it was impossible to say which was which. - G. Orwell