Date: Sat, 17 Jul 2010 16:30:03 +0200 From: Marco van Lienen <marco+freebsd-current@lordsith.net> To: Stefan Bethke <stb@lassitu.de> Cc: freebsd-current@FreeBSD.org Subject: Re: RAIDZ capacity (was ZFS version 15 committed to head) Message-ID: <20100717143003.GB62874@lordsith.net> In-Reply-To: <86DB038E-D49B-4793-B966-6B5D29FA3B84@lassitu.de> References: <4C3C7202.7090103@FreeBSD.org> <20100717101459.GA13626@lordsith.net> <9E4FCF4C-7A69-426E-9F39-B5487D4CB07C@lassitu.de> <20100717105134.GB13626@lordsith.net> <86DB038E-D49B-4793-B966-6B5D29FA3B84@lassitu.de>
next in thread | previous in thread | raw e-mail | index | archive | help
--tKW2IUtsqtDRztdT Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Jul 17, 2010 at 01:04:52PM +0200, you (Stefan Bethke) sent the foll= owing to the -current list: > >=20 > > I have read many things about those differences, but why then does zfs = on opensolaris report more available space whereas FreeBSD does not? > > That would imply that my friend running osol build 117 couldn't fill up= his raidz pool past the 3.56T. >=20 > You didn't show us how your friends pool is set up. >=20 > With RAIDZ1, the capacity of one of the devices in the pool is used for r= edundancy, with RAIDZ2 it's two disks worth. So three 2TB disks with RAIDZ= 1 gives you 4TB net capacity. If you don't care about redundancy, use a si= mple concatenation, i. e. don't specify mirror, raidz or raidz2 when creati= ng the pool. My friend created his raidz pool just the same way as I did: zpool create p= ool2 raidz c0d0 c0d1 c0d2 So just 3 dedicated drives. I also posted the example of creating a test raidz pool based on 3 65Mb fil= es. On osol there is more available space being reported by 'zfs list' on that = test raidz pool When I created a similar test raidz pool also based on 3 65Mb files, 'zfs l= ist' on my FreeBSD boxes (9.0-CURRENT amd64 and 8.0-RELEASE-p2 i386) is sho= wing much less available space. So regardless whether we use whole disks or simply files for testing purpos= es, 'zfs list' on the osol system is reporting more available space. cheers, marco --tKW2IUtsqtDRztdT Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.15 (FreeBSD) iEYEAREDAAYFAkxBvmsACgkQjqALqIWA5ssw3ACeNKD0FwbqH9uUrdkDTC4vZlXH CyAAn0VvVciyU0M5/WJ4PBsH38hdiQVl =v0HX -----END PGP SIGNATURE----- --tKW2IUtsqtDRztdT--
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100717143003.GB62874>