From owner-freebsd-fs@FreeBSD.ORG Fri Dec 5 00:09:22 2014 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 94948D2C for ; Fri, 5 Dec 2014 00:09:22 +0000 (UTC) Received: from anubis.delphij.net (anubis.delphij.net [64.62.153.212]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "anubis.delphij.net", Issuer "StartCom Class 1 Primary Intermediate Server CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 78484C89 for ; Fri, 5 Dec 2014 00:09:22 +0000 (UTC) Received: from zeta.ixsystems.com (unknown [12.229.62.2]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (Client did not present a certificate) by anubis.delphij.net (Postfix) with ESMTPSA id 478051A2B7; Thu, 4 Dec 2014 16:09:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=delphij.net; s=anubis; t=1417738156; x=1417752556; bh=JGYb4gAozs0ma0fq0Gx19kZDRVP3if8N9PcKAW0nuiM=; h=Date:From:Reply-To:To:CC:Subject:References:In-Reply-To; b=0X8tQtga3vIoHYVSXZfduc9GNVqjpeYVCPG7sSSQQcXgXyo30wkhmIKz3TlVqnASO KwuzUM5FcjXhupliVJiTAHuhqAy1XwAXuagHAiI4sTqmNRQd2kpE/CY5QCABUTnIXu KnTHIxfvPXwQ/Mt7EKMh/iSht8apWIOKk7Y5nuoA= Message-ID: <5480F7AC.7080908@delphij.net> Date: Thu, 04 Dec 2014 16:09:16 -0800 From: Xin Li Reply-To: d@delphij.net Organization: The FreeBSD Project MIME-Version: 1.0 To: Bob Friesenhahn , d@delphij.net Subject: Re: ASHIFT=13 by default. References: <5480C336.8020901@multiplay.co.uk> <5480E48C.6040801@delphij.net> In-Reply-To: Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Cc: freebsd-fs@freebsd.org 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: Fri, 05 Dec 2014 00:09:22 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On 12/04/14 16:04, Bob Friesenhahn wrote: > On Thu, 4 Dec 2014, Xin Li wrote: >> >> BTW. Why bother to create zpools over zvols? Wouldn't it mean >> double checksumming? > > Clients of the zvol might corrupt the filesystem stored on it. > The double checksum would still help in that case. Sorry I'm not sure if I have followed -- Are you saying that you are exposing the zvol as e.g. iSCSI extent to a client (which, according to your creation doesn't seem like the case, since you are creating it from the same kernel...) or to a hypervisor like BHyVe? Cheers, - -- Xin LI https://www.delphij.net/ FreeBSD - The Power to Serve! Live free or die -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.1.0 (FreeBSD) iQIcBAEBCgAGBQJUgPerAAoJEJW2GBstM+nsbzAP/jyKQ+HgEKRq7mDgEspHc9Gz BDfg9onYalbNgU09+ZrKFu0eV75Uzqh6FoBcQR6GPDoB+nIjIv1/Pud+NgGr765y a1BckOIaDBHkAlPa1zpikAFriXowSNjbEtEuSkHzVIOSu4flXphHCPVr4/snAPZe jfsqpoVegWYxFSD+dLW1u+10nOL5hFsaq6qf9cbcDXSjyGnxi+wiLzFlGTiUS/+v UnS6yAqhfL+L21b64vylpyAfISc19SpYogGiDFBooebT2CBdSowAirBY4sEHGjb4 260vOJW7pIodD/KULATo9cXbgP6AI5wd9wQkaWi9wI3W7DaqHYXnS4naSDm+s3a1 T3npD64bnqNyhJMMEI0BzAxrFBTK2o/EEp4crQqxVojGTPRiWhmk0+YlJyap3i0x 93LG8g33MXiKeVJ+7Sbs+akwLxq3ZSBj/v5zBuXY8C3zkanLSIYEItsRTxSuEGjl Ti/7WTF9V+BJx9If53q1QrXQmGHJ3NjNHEXJSwVPH1U8RAUXBbBNW5GnZW4VJ07u z9ZaUYPpBaklJj3/cnqXw1fitI5e7mdoLpTLwgvoCkLuMFqm1w/O3H0qVT1UzT2q UIRM+XCdeieeJqRkm79CWq+6tTo6zhnv8ypXIWicQLGJtzLC6T9suZPTM6EtICzt sJf5zcBSb3pUxZZhfSbG =MXdZ -----END PGP SIGNATURE-----