Request for comments, new geom part type alias: freebsd-geom

[Warner Losh]

Why '-geom'? Why not 'freebsd-misc'?

And what, exactly, do you mean by 'create a GPT partition'?

Warner

On Sun, Jul 29, 2018 at 2:49 PM, David Cross <dcrosstech at gmail.com> wrote:

> I'd like to propose that we create a GPT partition for geom labeled
> partitions (gmirror, gstripe, geli, etc.. anything that can be 'tasted' and
> automatically determined.) called 'freebsd-geom'.
>
> There are numerous cases where you shouldn't have a raw geom on a disk (for
> example, imagine a raid 10 of a filesystem with VMs on it..on a raw disk
> its possible that the lead block happens to line up with a VM disk image or
> anything else a BIOS may determine is bootable).
>
> So the question becomes which part id to use; IF its a mirror of a swap of
> UFS it seems perfectly reasonable to use freebsd-swap or freebsd-ufs (if a
> bit dangerous).  If its a mirror or a geli then you can again be in the
> situation where the boot blocks (or something else), in certain
> circumstances mistakes these for raw filesystems with similarly calamitous
> results.
>
> Given these, it seems a 'freebsd-geom' (or similar) seems entirely
> appropriate; we can mark these for what they really are, and eliminate
> these cases where the system misinterprets intentions based on ambiguous
> data.
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