From owner-freebsd-stable@freebsd.org Wed Feb 8 18:48:15 2017 Return-Path: Delivered-To: freebsd-stable@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 CE347CD6E38 for ; Wed, 8 Feb 2017 18:48:15 +0000 (UTC) (envelope-from petefrench@ingresso.co.uk) Received: from mailman.ysv.freebsd.org (unknown [127.0.1.3]) by mx1.freebsd.org (Postfix) with ESMTP id B9B561D94 for ; Wed, 8 Feb 2017 18:48:15 +0000 (UTC) (envelope-from petefrench@ingresso.co.uk) Received: by mailman.ysv.freebsd.org (Postfix) id B62FACD6E37; Wed, 8 Feb 2017 18:48:15 +0000 (UTC) Delivered-To: stable@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 B5E29CD6E36 for ; Wed, 8 Feb 2017 18:48:15 +0000 (UTC) (envelope-from petefrench@ingresso.co.uk) Received: from constantine.ingresso.co.uk (ingresso-1-pt.tunnel.tserv1.lon2.ipv6.he.net [IPv6:2001:470:1f1c:411::2]) (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 861B31D92; Wed, 8 Feb 2017 18:48:15 +0000 (UTC) (envelope-from petefrench@ingresso.co.uk) Received: from dilbert.london-internal.ingresso.co.uk ([10.64.50.6] helo=dilbert.ingresso.co.uk) by constantine.ingresso.co.uk with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.88 (FreeBSD)) (envelope-from ) id 1cbXHp-000HeS-P2; Wed, 08 Feb 2017 18:48:13 +0000 Received: from petefrench by dilbert.ingresso.co.uk with local (Exim 4.87_1 (FreeBSD)) (envelope-from ) id 1cbXHp-0007oo-Mm; Wed, 08 Feb 2017 18:48:13 +0000 Date: Wed, 08 Feb 2017 18:48:13 +0000 To: trociny@FreeBSD.org, petefrench@ingresso.co.uk Subject: Re: HASt and write amplification on the seconday Cc: stable@freebsd.org References: <20170208151820.GA7364@gmail.com> In-Reply-To: <20170208151820.GA7364@gmail.com> User-Agent: Heirloom mailx 12.4 7/29/08 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-Id: From: Pete French X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 08 Feb 2017 18:48:15 -0000 > Extents (2 meg blocks) are used for synchronization after the > secondary is reconnected. Normally (the secondary is connected) writes > to the primary and the secondary are the same. Ah, Ok, that was not clear to me from the documentation. That would also expain what I was seeing when I did a resyc a while ago. OK, thats arekief as I was worrying that I had a wirte apliification factor of 4096 on top of an SSD! Thanks for taking the time to explain... -pete.