Date: Mon, 18 Mar 2019 18:56:03 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: freebsd-virtualization@freebsd.org, FreeBSD <freebsd-stable@freebsd.org> Subject: Re: bhyve zfs resizing Message-ID: <f7b4a7d7-4c07-22f2-8d56-9a62c685ea5c@quip.cz> In-Reply-To: <20190318152525.GC91631@rpi3.zyxst.net> References: <20190318150404.GB91631@rpi3.zyxst.net> <CAOtMX2j55KCrwSgoPUmGfgsRYdL4ivwC0kf=ODqHf7gwe6H3Gg@mail.gmail.com> <20190318152525.GC91631@rpi3.zyxst.net>
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tech-lists wrote on 2019/03/18 16:25:
> On Mon, Mar 18, 2019 at 09:08:31AM -0600, Alan Somers wrote:
>>
>> Do you mean using a zvol as the backing store for a VM? If so, then:
>> 1) Yes. You can just do "zfs set volsize" on the host.
>> 2) In theory no, but the guest may need to be rebooted to notice the
>> change. And I'm not sure if the current bhyve code will expose the
>> new size without a reboot or not.
>> 3) Sure. But after you expand the zvol (or before you shrink it),
>> you'll have to change the size of the guest's filesystem using the
>> guest's native tools.
I did it 2 month ago on FreeBSD 11.2.
On the host with running guest:
# zfs set volsize=200G tank1/vol1/bhyve/kotel/disk1
Even if I unmounted disk in the guest it still does not see the new size
until I rebooted the guest.
After reboot of the guest, you will see corrupted GPT:
# gpart show -p vtbd1
=> 40 209715120 vtbd1 GPT (200G) [CORRUPT]
40 8 - free - (4.0K)
48 1024 vtbd1p1 freebsd-boot (512K)
1072 976 - free - (488K)
2048 203423744 vtbd1p2 freebsd-ufs (97G)
203425792 6289368 - free - (3.0G)
And after running recover, the guest will see the added space
# gpart recover vtbd1
vtbd1 recovered
# gpart show -p vtbd1
=> 40 419430320 vtbd1 GPT (200G)
40 8 - free - (4.0K)
48 1024 vtbd1p1 freebsd-boot (512K)
1072 976 - free - (488K)
2048 203423744 vtbd1p2 freebsd-ufs (97G)
203425792 216004568 - free - (103G)
After this, the partition can finally be enlarged
# gpart resize -a 1M -s 197G -i 2 vtbd1
# growfs /vol0
Kind regards
Miroslav Lachman
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