GPT partitions not 4k aligned by 10.1-RC1 installer

[Mark Felder]

On Thu, Oct 9, 2014, at 21:06, Mark Martinec wrote:
> Today I did a quick install of a 10.1-RC1 from an installation
> ISO DVD. Apart from choosing a ZFS filesystem, other options were
> left to their default. In particular, the align-to-4k ZFS options
> was left enabled.
> 
> Guess what, the ZFS really ended up with ashift 12,
> but neither the swap nor the zfs partition is 4k aligned:
> 
> # gpart show /dev/ada0
> =>       34  625142381  ada0  GPT  (298G)
>           34       1024     1  freebsd-boot  (512K)
>         1058    8388608     2  freebsd-swap  (4.0G)
>      8389666  616752749     3  freebsd-zfs  (294G)
> 
> I find this unacceptable and surprising,
> regardless of what the underlying media is.
> 
> Now that even Windows is aligning partitions to 1 MiB,
> and SSD erase block is often cited as 1 MiB ...
> 
> Worried about space waste of half of one JPG photo?
> 

Thanks for the report. The installer should be using gpart -a to create
the partition aligned, but your result shows that did not happen.