Date: Tue, 19 Oct 2010 00:26:11 +0200 From: Pawel Jakub Dawidek <pjd@FreeBSD.org> To: Pete French <petefrench@ticketswitch.com> Cc: freebsd-fs@freebsd.org Subject: Re: Converting a non-HAST ZFS pool to a HAST pool Message-ID: <20101018222611.GC2375@garage.freebsd.pl> In-Reply-To: <E1P7nUu-000Fy0-LZ@dilbert.ticketswitch.com> References: <20101016222833.GA6765@garage.freebsd.pl> <E1P7nUu-000Fy0-LZ@dilbert.ticketswitch.com>
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--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--
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