freebsd stable - May 2019 - trying to expand a zvol-backed bhyve guest which is UFS

On Sun, May 19, 2019 at 9:47 PM tech-lists <tech-lists at zyxst.net>
wrote:
> Thanks very much to you both, all sorted now. I didn't realise there
was
> a 2TB limit for MBR either. Can I shrink the 4TB to 2TB on the zfs side
> without scrambling the ufs on the guest?
>
You can snapshot the zvol to be safe, but you should be able to shrink it
to the existing partition size.  If it's a sparse zvol, it may not may that
much difference.
-- 
Adam

On Sun, May 19, 2019 at 10:17:35PM -0500, Adam wrote:
>On Sun, May 19, 2019 at 9:47 PM tech-lists <tech-lists at zyxst.net>
wrote:
>
>> Thanks very much to you both, all sorted now. I didn't realise
there was
>> a 2TB limit for MBR either. Can I shrink the 4TB to 2TB on the zfs side
>> without scrambling the ufs on the guest?
>>
>
>You can snapshot the zvol to be safe, but you should be able to shrink it
>to the existing partition size.  If it's a sparse zvol, it may not may
that
>much difference.
The zvol has about 515GB data. Hopefully zfs is smart enough to shrink
to the MBR boundary.
-- 
J.
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