From owner-freebsd-fs@FreeBSD.ORG Mon Oct 18 22:26:50 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E5B221065670 for ; Mon, 18 Oct 2010 22:26:50 +0000 (UTC) (envelope-from pjd@garage.freebsd.pl) Received: from mail.garage.freebsd.pl (60.wheelsystems.com [83.12.187.60]) by mx1.freebsd.org (Postfix) with ESMTP id 900DF8FC0A for ; Mon, 18 Oct 2010 22:26:49 +0000 (UTC) Received: by mail.garage.freebsd.pl (Postfix, from userid 65534) id AD79645C98; Tue, 19 Oct 2010 00:26:47 +0200 (CEST) Received: from localhost (chello089073192049.chello.pl [89.73.192.49]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.garage.freebsd.pl (Postfix) with ESMTP id 2FFCC45C9B; Tue, 19 Oct 2010 00:26:42 +0200 (CEST) Date: Tue, 19 Oct 2010 00:26:11 +0200 From: Pawel Jakub Dawidek To: Pete French Message-ID: <20101018222611.GC2375@garage.freebsd.pl> References: <20101016222833.GA6765@garage.freebsd.pl> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="IpbVkmxF4tDyP/Kb" Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4.2.3i X-PGP-Key-URL: http://people.freebsd.org/~pjd/pjd.asc X-OS: FreeBSD 9.0-CURRENT amd64 X-Spam-Checker-Version: SpamAssassin 3.0.4 (2005-06-05) on mail.garage.freebsd.pl X-Spam-Level: X-Spam-Status: No, score=-0.6 required=4.5 tests=BAYES_00,RCVD_IN_SORBS_DUL autolearn=no version=3.0.4 Cc: freebsd-fs@freebsd.org Subject: Re: Converting a non-HAST ZFS pool to a HAST pool 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: Mon, 18 Oct 2010 22:26:51 -0000 --IpbVkmxF4tDyP/Kb Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Oct 18, 2010 at 12:03:20PM +0100, Pete French wrote: > > HAST metadata takes much more space than glabel metadata. The latter > > takes only one sector, while the former depends on provider size, but we > > have to keep entire extent bitmap there, so definitely more than one > > sector. >=20 > I am attempting to do the same thing - convert a ZFS pool over to using > hast. I have a current setup using gmirror, ggated and a pair of labeled > drives. Luckily it seems that the meta data used by gmirror+glabel is bii= ger > than that used by hast - so I should be able to do this without recreating > the pool. Maybe I'm missing something, but how do you guys check this? Both gmirror and glabel use only single sector for its metadata, so 1kB in total. HAST metadata takes 4kB plus activemap size, which depends on provider size. --=20 Pawel Jakub Dawidek http://www.wheelsystems.com pjd@FreeBSD.org http://www.FreeBSD.org FreeBSD committer Am I Evil? Yes, I Am! --IpbVkmxF4tDyP/Kb Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.14 (FreeBSD) iEYEARECAAYFAky8yYIACgkQForvXbEpPzR6oQCfYqUPm/GLrBeFlLt4Kswh3/87 gqQAnj7+ez3YYEK/zHqWCwxS4cojkl9U =QEin -----END PGP SIGNATURE----- --IpbVkmxF4tDyP/Kb--