Date: Wed, 13 Jun 2012 12:18:14 +0200 From: Olivier Smedts <olivier@gid0.org> To: Irjohn Junus <i.junus@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: gpart add -a 4096 vs 4k Message-ID: <CABzXLYNZPO90fA41HGcJ-D-thE7KT586S5k7eo41GxLXBrWuCQ@mail.gmail.com> In-Reply-To: <CALXkR%2B879QJPNisOKA71yej9m1%2BUiz4cNopkoM42irmRoaBL-g@mail.gmail.com> References: <CALXkR%2B879QJPNisOKA71yej9m1%2BUiz4cNopkoM42irmRoaBL-g@mail.gmail.com>
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Hello, 2012/6/13 Irjohn Junus <i.junus@gmail.com>: > Hello, > > Relatively new to FreeBSD and learning, I'm trying to partition my HDD and > align it to 4k sector. > > I do apologize if this has been answered before, I have Googled and read > gpart(8) man page to no joy. Can anyone please advice why gpart add '-a > 4096' doesn't yield the same result with '-a 4k'? Many thanks and captures > are below. > > Regards, > Ronjns > > > > #gpart add -t freebsd-zfs -l hdd0 *-a 4096* da0 > da0p1 added > # gpart show da0 > => 34 3907029101 da0 GPT (1.8T) > 34 4062 - free - (2M) > *4096 3907022848* 1 freebsd-zfs (1.8T) > 3907026944 2191 - free - (1.1M) > > > > # gpart add -t freebsd-zfs -l hdd0 *-a 4k* da0 > da0p1 added > # gpart show da0 > => 34 3907029101 da0 GPT (1.8T) > 34 6 - free - (3.0k) > *40 3907029088* 1 freebsd-zfs (1.8T) > 3907029128 7 - free - (3.5k) We're talking of sectors here, se "4096" does not mean 4 KB but 4096*512=2MB. I think you should use "-a 8", because 4k sectors = 8*512B sectors. -- Olivier Smedts _ ASCII ribbon campaign ( ) e-mail: olivier@gid0.org - against HTML email & vCards X www: http://www.gid0.org - against proprietary attachments / \ "Il y a seulement 10 sortes de gens dans le monde : ceux qui comprennent le binaire, et ceux qui ne le comprennent pas."help
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