Date: Sun, 1 Jun 2014 14:31:52 -0700 From: Matthew Ahrens <mahrens@delphix.com> To: Nathan Whitehorn <nwhitehorn@freebsd.org> Cc: freebsd-fs <freebsd-fs@freebsd.org>, FreeBSD Hackers <freebsd-hackers@freebsd.org>, George Wilson <george.wilson@delphix.com> Subject: Re: fdisk(8) vs gpart(8), and gnop Message-ID: <CAJjvXiHAvPptAUOg3aO35v32%2BF3VqG_8tNjgknOZ6qM1EeNK=w@mail.gmail.com> In-Reply-To: <538B4CEF.2030801@freebsd.org> References: <20140601004242.GA97224@bewilderbeast.blackhelicopters.org> <CAOjFWZ5N9FGwgSz0_YFNQjavzdJDitRn52VKn4ipW1ddj6-weQ@mail.gmail.com> <BCA9F5D6-3925-4E7E-9082-128652508305@FreeBSD.org> <3D6974D83AE9495E890D9F3CA654FA94@multiplay.co.uk> <538B4CEF.2030801@freebsd.org>
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On Sun, Jun 1, 2014 at 8:55 AM, Nathan Whitehorn <nwhitehorn@freebsd.org> wrote: > On 06/01/14 08:52, Steven Hartland wrote: > >> ----- Original Message ----- From: "Mark Felder" <feld@freebsd.org> >> >> On May 31, 2014, at 20:57, Freddie Cash <fjwcash@gmail.com> wrote: >>> >>> There's a sysctl where you can set the minimum ashift for zfs. Then you >>>> never need to use gnop. >>>> >>>> I believe it's part of 10.0? >>>> >>> >>> I've not seen this yet. What we need is to port the ability to set >>> ashift at pool creation time: >>> >>> $ zpool create -o ashift=12 tank mirror disk1 disk2 mirror disk3 disk4 >>> >>> I believe the Linux zfs port has this functionality now, but we still do >>> not. >>> >> I am strongly against implementing "-o ashift=12"[*]. If we need to explicitly tell ZFS what sector size to use, we should make that intention clear with an appropriately named property, for example "-o device_sector_size=4K". Even better, this property should be per-disk. --matt [*] Once we implement an appropriately-named property, I would be OK with also allowing the "-o ashift=12" as a Linux compatibility feature. > >> We don't have that direct option yet but you can achieve the >> same thing by setting: vfs.zfs.min_auto_ashift=12 >> >> Does anyone have any objections to me changing this default, right now, > today? > -Nathan > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >
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