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Date: Tue, 22 May 2012 15:48:47 +0200
From: Matthias Apitz <guru@unixarea.de>
To: freebsd-hackers@freebsd.org
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Subject: Re: proper newfs options for SSD disk
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El día Tuesday, May 22, 2012 a las 07:42:18AM -0600, Warren Block escribió:

> On Tue, 22 May 2012, Matthias Apitz wrote:
> 
> > El día Sunday, May 20, 2012 a las 03:36:01AM +0900, rozhuk.im@gmail.com escribió:
> >>
> >> Do not use MBR (or manually do all to align).
> >> 63 - not 4k aligned.
> >
> > To create the above shown partition layout I have not used gpart(8); I
> > just said:
> >
> >    # fdisk -I /dev/ada0
> >    # fdisk -B /dev/ada0
> >
> >  ...
> > What is wrong with this procedure?
> 
> The filesystem partitions end up at locations that aren't even multiples 
> of 4K.  This can reduce performance.  How much probably depends on the 
> SSD.

But this is then rather a bug in fdisk(8) and not a PEBKAC, or? :-)

	matthias

-- 
Matthias Apitz
e <guru@unixarea.de> - w http://www.unixarea.de/
UNIX since V7 on PDP-11, UNIX on mainframe since ESER 1055 (IBM /370)
UNIX on x86 since SVR4.2 UnixWare 2.1.2, FreeBSD since 2.2.5