Date: Fri, 11 Sep 2015 08:25:30 -0600 (MDT) From: Warren Block <wblock@wonkity.com> To: "William A. Mahaffey III" <wam@hiwaay.net> Cc: FreeBSD Questions !!!! <freebsd-questions@freebsd.org> Subject: Re: followup storage question Message-ID: <alpine.BSF.2.20.1509110821560.6365@wonkity.com> In-Reply-To: <55F2D086.6060509@hiwaay.net> References: <55F2D086.6060509@hiwaay.net>
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On Fri, 11 Sep 2015, William A. Mahaffey III wrote: > The Wiki page https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/9.0-RELEASE > illustrates using gnop to enforce 4K alignment of gpt partitions for > subsequent use by ZFS. However the gpart commands also use the '-a 4k' > arguments, aligning partitions on 4k boundaries as I understand things. Is > the gnop command also necessary ? TIA & have a nice weekend. These are two separate things. gnop(8) is (was) used to force ZFS to use a 4K block size. That just means it transfers data in multiples of 4K, not necessarily aligned with the 4K sectors on the drive. gpart(8)'s -a flag is used to force partitions to begin in alignment with the 4K sectors on the drive.
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