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@gmai... 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.