upgrade stable/12 -> stable/13 zfs + boot partition Mediasize 64K

[Russell L. Carter]

On 2/11/21 9:34 PM, Bakul Shah wrote:
> On Feb 11, 2021, at 7:13 PM, Russell L. Carter <rcarter at pinyon.org> wrote:
>>
>> root at terpsichore> gpart show
>> =>       34  625142381  da0  GPT  (298G)
>>          34        128    1  freebsd-boot  (64K)
>>         162    8388608    2  freebsd-swap  (4.0G)
>>     8388770  616753645    3  freebsd-zfs  (294G)
> 
> You can do something like
> 
> gpart delete -i 2 da0
> gpart resize -s 512k -i 1 da0
> gpart add -t freebsd-swap da0
> gpart bootcode -p /boot/gptzfsboot -i 1 da0

This reminds me of a question that I had, does a stable/13
installworld install the bootcode?  I am now guessing it
doesn't, on account of it might be difficult to figure
out what partition to install it to.

That might explain why the zfs root boot over the stable/12
disks failed.

> 
> gpart list da0
> will show the swap partition last but it will still be /dev/da0p2
> 
> Practice on a md0 device if you want to test this.
> 
> truncate -s 20G file
> mdconfig -a -t vnode -f file
> gpart create -s GPT md0
> etc.
> 

I really appreciate these instructions, thank you.

Russell