From owner-freebsd-fs@FreeBSD.ORG Thu Jun 22 10:00:16 2006 Return-Path: X-Original-To: freebsd-fs@FreeBSD.org Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 2C2BC16A47B for ; Thu, 22 Jun 2006 10:00:16 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: from mail.garage.freebsd.pl (arm132.internetdsl.tpnet.pl [83.17.198.132]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6807F43D8B for ; Thu, 22 Jun 2006 10:00:15 +0000 (GMT) (envelope-from pjd@garage.freebsd.pl) Received: by mail.garage.freebsd.pl (Postfix, from userid 65534) id 5936851814; Thu, 22 Jun 2006 12:00:14 +0200 (CEST) Received: from localhost (pjd.wheel.pl [10.0.1.1]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.garage.freebsd.pl (Postfix) with ESMTP id A2EA550E81; Thu, 22 Jun 2006 12:00:10 +0200 (CEST) Date: Thu, 22 Jun 2006 11:57:32 +0200 From: Pawel Jakub Dawidek To: Rong-en Fan Message-ID: <20060622095732.GE30568@garage.freebsd.pl> References: <20060619131101.GD1130@garage.freebsd.pl> <6eb82e0606201246n49474ea0of423bec93b13c293@mail.gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="SWTRyWv/ijrBap1m" Content-Disposition: inline In-Reply-To: <6eb82e0606201246n49474ea0of423bec93b13c293@mail.gmail.com> X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 7.0-CURRENT i386 User-Agent: mutt-ng/devel-r804 (FreeBSD) X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on mail.garage.freebsd.pl X-Spam-Level: X-Spam-Status: No, score=-5.9 required=3.0 tests=ALL_TRUSTED,BAYES_00 autolearn=ham version=3.0.4 Cc: freebsd-fs@FreeBSD.org Subject: Re: Journaling UFS with gjournal. X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 22 Jun 2006 10:00:16 -0000 --SWTRyWv/ijrBap1m Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tue, Jun 20, 2006 at 03:46:17PM -0400, Rong-en Fan wrote: +> Hi, +>=20 +> This sounds very exciting to me! +>=20 +> I think I must miss something in this announcement. How +> much space will be used for journal? For example, if +> the provider is 80G, how much I will lost due to gjournal? The size of the journal don't depend on file system size. It more depend on your disk speed and file system load. For example your disk can write at 60MB/s. Journal switch time is 10 seconds. The journal provider has to have place to keep two journals (active and inactive). So bascially you need 60*10*2MB + gjournal headers. I think 2GB is a safe default. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --SWTRyWv/ijrBap1m Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFEmmmMForvXbEpPzQRAsfQAJ9KBVPcs0YzYFpdB4KYnowL2THGAwCgrs3Z JDQGDV+fIrOY7wov1OkJRko= =qPbz -----END PGP SIGNATURE----- --SWTRyWv/ijrBap1m--