Date: Tue, 26 Jul 2011 21:07:26 +0100 From: krad <kraduk@gmail.com> To: Gary Corcoran <gcorcoran@rcn.com> Cc: freebsd-fs@freebsd.org Subject: Re: 3TB drives on ZFS and booting Message-ID: <CALfReyfLzWnCdzFxgE%2B9yqKEBBW2u-ieFagmkrREJ-t_fEmp-A@mail.gmail.com> In-Reply-To: <4E2C9419.4000205@rcn.com> References: <4E2C9419.4000205@rcn.com>
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On 24 July 2011 22:52, Gary Corcoran <gcorcoran@rcn.com> wrote: > I have seen conflicting information on the internet about this, and so > I would like a direct answer from someone who knows for sure. Does > FreeBSD's > ZFS work with 3TB drives, and is it possible to do a ZFS-only (i.e. boot > from > ZFS) installation with 3TB drives on FreeBSD? I presume that since ZFS was > designed > to handle huge filesystems, it would have no problem with 3TB drives, but I > guess > the real question is the ZFS boot code - can it currently handle >2TB > drives? > Bottom line: would I be able to successfully build (and of course boot) a > FreeBSD > ZFS-only system using only 3TB drives? > > Thanks, > Gary > > ______________________________**_________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/**mailman/listinfo/freebsd-fs<http://lists.freebsd.org/mailman/listinfo/freebsd-fs>; > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@**freebsd.org<freebsd-fs-unsubscribe@freebsd.org> > " > The main issue with 3tb drives will be the 4k sector size. This applies to most of the 2tb drives as well. Make sure you use GPT layout and align it. IE make sure each gpt partiion start sector is / by 8 and its size is. Here is mine for an example $ gpart show ada0 => 34 3907029101 ada0 GPT (1.8T) 34 6 - free - (3.0k) 40 128 1 freebsd-boot (64k) 168 6291456 2 freebsd-swap (3.0G) 6291624 3900213229 3 freebsd-zfs (1.8T) also make sure you use gpt boot blocks that can cope with 4k aligned drives. Use the ones from current or these binary ones http://people.freebsd.org/~pjd/zfsboot/
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