proper newfs options for SSD disk

[Warren Block]

On Tue, 22 May 2012, Matthias Apitz wrote:

> El día Sunday, May 20, 2012 a las 03:36:01AM +0900, rozhuk.im at 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
>
>    # bsdlabel -w ada0s1 auto
>    # bsdlabel -B ada0s1
>
>    changed partition "a" from "unused" to "4.2BSD" as partition type:
>
>    # setenv EDITOR /usr/bin/vi
>    # bsdlabel -e ada0s1
>
>    created the future root-filesystem on it
>
>    # newfs -m 0 -o space /dev/ada0s1a
>
> The 2nd SSD was formated like this:
>
>    # dd if=/dev/zero of=/dev/ada1 count=2
>    # fdisk -I /dev/ada1
>    # newfs -m 0 -o space /dev/ada1s1a
>    # echo "/dev/ada1s1a  /usr/local  ufs  rw,noatime  1  1" >> /etc/fstab
>    # mount /usr/local
>
> 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.