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Date: Tue, 22 May 2012 08:40:56 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Matthias Apitz <guru@unixarea.de>
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	(wonkity.com [127.0.0.1]); Tue, 22 May 2012 08:40:56 -0600 (MDT)
Cc: freebsd-hackers@freebsd.org
Subject: Re: proper newfs options for SSD disk
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On Tue, 22 May 2012, Matthias Apitz wrote:

> 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? :-)

A bug in the design of MBR.  Which probably can be forgiven, considering 
when it was created and the other problems with it. :)

gpart's alignment option can be used with MBR slices and bsdlabel 
partitions.
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