freebsd stable - Jan 2017 - Boot partition size

On 30/1/17 2:20pm, Freddie Cash wrote:
> And, you may be able to do that on the existing disks, as ZFS now leaves a
MB or two of "slack space" at the end of the device used in the vdev.
This allows for using drives/partitions that are the same size in MB but have
different numbers of sectors. This was an issue on the early ZFS days.
> 
> So, you may be able to resize the freebsd-zfs partition by a handful of KB
without actually changing the size of the vdev.

Brilliant, thank you. That worked a treat with a new boot size of 256k.


Note that this page: https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror needs
to be adjusted. This line:

    gpart add -b 34 -s 128k -t freebsd-boot ad0

needs to instead be

    gpart add -a 4k -s 512k -t freebsd-boot ad0


I don't have edit rights. Probably someone needs to clean up and merge many
of these pages: https://wiki.freebsd.org/RootOnZFS/


Ari



-- 
-------------------------->
Aristedes Maniatis
CEO, ish
https://www.ish.com.au
GPG fingerprint CBFB 84B4 738D 4E87 5E5C  5EFA EF6A 7D2E 3E49 102A

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Its worth noting you should also go for GPT layout and have a 100meg or so
partition provisioned as well so you can do a uefi boot. Even if you arent
going to use it right now.


On 30 January 2017 at 03:41, Aristedes Maniatis <ari at ish.com.au> wrote:
> On 30/1/17 2:20pm, Freddie Cash wrote:
> > And, you may be able to do that on the existing disks, as ZFS now
leaves
> a MB or two of "slack space" at the end of the device used in the
vdev.
> This allows for using drives/partitions that are the same size in MB but
> have different numbers of sectors. This was an issue on the early ZFS days.
> >
> > So, you may be able to resize the freebsd-zfs partition by a handful
of
> KB without actually changing the size of the vdev.
>
>
> Brilliant, thank you. That worked a treat with a new boot size of 256k.
>
>
> Note that this page: https://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/Mirror
> needs to be adjusted. This line:
>
>     gpart add -b 34 -s 128k -t freebsd-boot ad0
>
> needs to instead be
>
>     gpart add -a 4k -s 512k -t freebsd-boot ad0
>
>
> I don't have edit rights. Probably someone needs to clean up and merge
> many of these pages: https://wiki.freebsd.org/RootOnZFS/
>
>
> Ari
>
>
>
> --
> -------------------------->
> Aristedes Maniatis
> CEO, ish
> https://www.ish.com.au
> GPG fingerprint CBFB 84B4 738D 4E87 5E5C  5EFA EF6A 7D2E 3E49 102A
>
>