Date: Sat, 10 Sep 2016 20:38:34 -0700 From: perryh@pluto.rain.com (Perry Hutchison) To: wblock@wonkity.com Cc: brandon.wandersee@gmail.com, freebsd-questions@freebsd.org Subject: Re: "gpart add" falsely claiming "No space left on device" Message-ID: <57d4d1ba.8U9%2BKrRH1rRsodn4%perryh@pluto.rain.com> In-Reply-To: <alpine.BSF.2.20.1609091312370.90996@wonkity.com> References: <57ce6e64.EITkODjuwy6pZ4L%2B%perryh@pluto.rain.com> <alpine.BSF.2.20.1609060814030.1903@wonkity.com> <57cf9b95.Zj/JGHeshaKL6Zr5%perryh@pluto.rain.com> <alpine.BSF.2.20.1609070643120.24506@wonkity.com> <57d0f29b.3QNvCze7LJDzs0SU%perryh@pluto.rain.com> <86wpimm6om.fsf@WorkBox.Home> <57d276f6.CwaoGNki0kQYiZns%perryh@pluto.rain.com> <alpine.BSF.2.20.1609091312370.90996@wonkity.com>
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Warren Block <wblock@wonkity.com> wrote: > Support for 8.1 ended over four years ago. Improvements to man > pages are not MFCed back to unsupported releases. Nor would it matter (in this case) if they were, since I'm running 8.1 (not following 8-STABLE). > > Alignment to 4k makes sense if the physical sector size is 4k (as > > is often the case with newer disk drives) -- but 1M? Seems a bit > > much, which is why it would be useful for that page to include a > > more detailed explanation. > > 1M is a useful value for several reasons. A partition aligned with 1M > is aligned with all the smaller values. It also better fits with the > larger internal block sizes used by SSDs and other flash devices. > > Starting the first data partition at 1M is a de facto standard and > provides a little additional insurance that some rock-stupid > partitioning tool will see the partition and not destroy it. > > At most, aligning to 1M wastes less than one meg of space. Not one gig, > one meg. On UEFI systems, you can even use that small amount of space > for an EFI partition. Hopefully some of this explanation will find its way into that disksetup.html page :)
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