From owner-freebsd-fs@FreeBSD.ORG Wed Feb 25 14:57:12 2015 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 151BF832 for ; Wed, 25 Feb 2015 14:57:12 +0000 (UTC) Received: from out1-smtp.messagingengine.com (out1-smtp.messagingengine.com [66.111.4.25]) (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 D9918213 for ; Wed, 25 Feb 2015 14:57:11 +0000 (UTC) Received: from compute1.internal (compute1.nyi.internal [10.202.2.41]) by mailout.nyi.internal (Postfix) with ESMTP id 2C0B120DCD for ; Wed, 25 Feb 2015 09:57:03 -0500 (EST) Received: from web3 ([10.202.2.213]) by compute1.internal (MEProxy); Wed, 25 Feb 2015 09:57:03 -0500 DKIM-Signature: v=1; a=rsa-sha1; c=relaxed/relaxed; d= messagingengine.com; h=message-id:x-sasl-enc:from:to :mime-version:content-transfer-encoding:content-type:in-reply-to :references:subject:date; s=smtpout; bh=zMD9SqVGanasr837ZDraY2z6 Dq0=; b=plgQ+YIixGUyADvFj0BquuPglAC1TFX2i2eiVCcNarpLQ/N6/Nv6a4qm MWr/7Lc5wOOxwSAbpjzBGykgI+UVe9GXZX29BsZmkpXGozqmRBTguwzoRYj1Du6r P9h5I80tvaW3gXCvwzrZTFFth4tEJfqKBUObKepVNinMDB/cFJE= Received: by web3.nyi.internal (Postfix, from userid 99) id D2EAE11B4A1; Wed, 25 Feb 2015 09:57:03 -0500 (EST) Message-Id: <1424876223.3248960.232271733.32363554@webmail.messagingengine.com> X-Sasl-Enc: hxf33gbwIe2pdLN54KpRdXIuow96vmxvc/JmEasIimQR 1424876223 From: Mark Felder To: freebsd-fs@freebsd.org MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Type: text/plain X-Mailer: MessagingEngine.com Webmail Interface - ajax-4ba7306c In-Reply-To: References: Subject: Re: Zoned Commands ZBS/ZAC, Shingled SMR/SFS, ZFS Date: Wed, 25 Feb 2015 08:57:03 -0600 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: Wed, 25 Feb 2015 14:57:12 -0000 On Fri, Feb 20, 2015, at 14:15, grarpamp wrote: > These may be of interest for possible integration... > Do I understand the scope of this correctly: - SMR drives are the future for increasing drive capacity - SMR drives are terrible at random IO - There is work in Linux to detect these SMR drives and alter ZFS' behavior Is that correct? If so, it's interesting... but sort of annoying that we are basically creating quirks and a wildly different codepath because the drive manufacturers haven't figured out another way to increase density and keep expected behavior.