Date: Tue, 20 Jun 2006 10:41:10 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Brooks Davis <brooks@one-eyed-alien.net> Cc: freebsd-fs@freebsd.org, freebsd-current@freebsd.org, freebsd-geom@freebsd.org Subject: Re: Journaling UFS with gjournal. Message-ID: <20060620084110.GC6235@garage.freebsd.pl> In-Reply-To: <20060619185800.GA22546@odin.ac.hmc.edu> References: <20060619131101.GD1130@garage.freebsd.pl> <20060619185800.GA22546@odin.ac.hmc.edu>
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--2/5bycvrmDh4d1IB Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jun 19, 2006 at 11:58:00AM -0700, Brooks Davis wrote: +> On Mon, Jun 19, 2006 at 03:11:01PM +0200, Pawel Jakub Dawidek wrote: +> >=20 +> > How it works (in short). You may define one or two providers which +> > gjournal will use. If one provider is given, it will be used for both - +> > data and journal. If two providers are given, one will be used for data +> > and one for journal. +> > Every few seconds (you may define how many) journal is terminated and +> > marked as consistent and gjournal starts to copy data from it to the +> > data provider. In the same time new data are stored in new journal. +> > Let's call the moment in which journal is terminated as "journal switc= h". +>=20 +> Cool solution! I think I'll give this a try on my redundent mirror +> server at work. I'd be curious to see how gjournal performs with the +> journal on a battery backed ram disk like the gigabyte i-RAM: +>=20 +> http://www.giga-byte.com/Products/Storage/Products_Overview.aspx?Product= ID=3D2180&ProductName=3DGC-RAMDISK I am curious too:) But as I said, there is still a lot of room for performance improvements. The bottleneck currently is file system synchronization, I think. I hope our VFS gurus will look into VFS_SYNC() optimizations. --=20 Pawel Jakub Dawidek http://www.wheel.pl pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --2/5bycvrmDh4d1IB Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (FreeBSD) iD8DBQFEl7SlForvXbEpPzQRAqB1AJ45J7spbBRtAcRzlA/ZhwzgNLz6PgCgmwRx y9ph5z7m5towyeZISTAnQik= =PdyB -----END PGP SIGNATURE----- --2/5bycvrmDh4d1IB--
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