Date: Fri, 19 Aug 2011 13:21:00 +0100 From: Aled Morris <aledm@qix.co.uk> To: Tom Evans <tevans.uk@googlemail.com> Cc: Yuri <yuri@rawbw.com>, freebsd-hackers@freebsd.org Subject: Re: ZFS installs on HD with 4k physical blocks without any warning as on 512 block size device Message-ID: <CAO1bj=ZHC0ZMtrQKr3DV8E3rP3gTMHxdF3J2EPAD3wR5dqN%2BkA@mail.gmail.com> In-Reply-To: <CAFHbX1K%2BRuzBKouAbN0%2BSCOSAkGNdgMzC92YN7GeKn_pD=J=tg@mail.gmail.com> References: <4E4D50CD.5080806@rawbw.com> <CAFHbX1K%2BRuzBKouAbN0%2BSCOSAkGNdgMzC92YN7GeKn_pD=J=tg@mail.gmail.com>
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On 19 August 2011 11:15, Tom Evans <tevans.uk@googlemail.com> wrote: > On Thu, Aug 18, 2011 at 6:50 PM, Yuri <yuri@rawbw.com> wrote: > > Some latest hard drives have logical sectors of 512 byte when they > actually > > have 4k physical sectors. > ... > Shouldn't UFS and ZFS drivers be able to either read the right sector size > > from the underlying device or at least issue a warning? > > The device never reports the actual sector size, so unless FreeBSD > keeps a database of 4k sector hard drives that report as 512 byte > sector hard drives, there is nothing that can be done. > > At what point should we change the default in newfs/zfs to 4k? I guess formatting the filesystem for 4k sectors on a 512b drive would still work but it would be suboptimal. What would the performance penalty be in reality? Aled
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