Date: Thu, 22 Jun 2006 11:57:32 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Rong-en Fan <grafan@gmail.com> Cc: freebsd-fs@FreeBSD.org Subject: Re: Journaling UFS with gjournal. Message-ID: <20060622095732.GE30568@garage.freebsd.pl> In-Reply-To: <6eb82e0606201246n49474ea0of423bec93b13c293@mail.gmail.com> References: <20060619131101.GD1130@garage.freebsd.pl> <6eb82e0606201246n49474ea0of423bec93b13c293@mail.gmail.com>
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--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--
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