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Date:      Mon, 20 May 2019 10:09:08 +0100
From:      tech-lists <tech-lists@zyxst.net>
To:        freebsd-stable@freebsd.org
Subject:   Re: trying to expand a zvol-backed bhyve guest which is UFS
Message-ID:  <20190520090907.GA36068@rpi3.zyxst.net>
In-Reply-To: <CA%2BtpaK16s3h1f%2BHAOp83H-MN_BoAjEf6GxKwzk0oDxnQo7f7wA@mail.gmail.com>
References:  <20190520014645.GC6971@rpi3.zyxst.net> <54BFD570-E9B9-49A5-8785-2D80D4FC05D1@gromit.dlib.vt.edu> <CAOjFWZ6yyPapu%2Bwv9ePhmPWPhDOBfE3g9tmj1PUi0vgsCp-O3Q@mail.gmail.com> <20190520024517.GA23482@rpi3.zyxst.net> <CA%2BtpaK16s3h1f%2BHAOp83H-MN_BoAjEf6GxKwzk0oDxnQo7f7wA@mail.gmail.com>

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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@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.
--=20
J.

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