bhyve VM drive size limit?

Ruben mail at osfux.nl
Sat Sep 2 15:02:04 UTC 2017


Hi Jason,


> Make sure
> you adjust the zvol block size in the default config before creating your
> guest or you will wonder where your storage starts to disappear to.
>
> Cheers,
>
> Jason
Perhaps slightly off-topic, but might you have any recommendations
regarding those blocksizes?

I'm not really that well versed in blocksizes / filesystems and am often
wondering where my 5TB zvol (bhyves into an ext4 volume for an ubuntu
guest) exactly disappears into :P

Regards,

Ruben
> On 2 Sep 2017 2:46 p.m., "Dylan Williams" <freebsd at host852.com> wrote:
>
> Dear all,
>
> Is there a limit with respect to the size of the virtual drive I can create
> for a VM using bhyve? Presumably not but I’m running into problems with a
> larger drive.
>
> I am trying to create a 4T Ubuntu machine on a FreeBSD11.1 server using
> iohyve. There’s plenty of drive space available so it’s not a drive space
> issue. I am able to create a 40G machine without any problems but exactly
> the same commands to create a 4000G machine results in a server that won’t
> boot past Grub. Is this an iohyve issue perhaps?
>
> Commands used that results in a working Ubuntu server:
>
> iohyve create ubu 40G
> iohyve set ubu loader=grub-bhyve os=debian ram=40G cpu=10
> iohyve install ubu ubuntu-16.04.3-server-amd64.iso <
> ftp://ftp.cuhk.edu.hk/pub/Linux/ubuntu-releases/16.04.3/
> ubuntu-16.04.3-server-amd64.iso>
>
> Commands used that results in a broken Ubuntu server:
>
> iohyve create ubu 4000G
> iohyve set ubu loader=grub-bhyve os=debian ram=40G cpu=10
> iohyve install ubu ubuntu-16.04.3-server-amd64.iso <
> ftp://ftp.cuhk.edu.hk/pub/Linux/ubuntu-releases/16.04.3/
> ubuntu-16.04.3-server-amd64.iso>
>
> The screen I get in the console when I boot (iohyve start ubu) the 4T
> machine is:
>
>                              GNU GRUB  version 2.00
>
>    Minimal BASH-like line editing is supported. For the first word, TAB
>    lists possible command completions. Anywhere else TAB lists possible
>    device or file completions.
>
>
> grub>
>
> Does anyone have any ideas? I’ve been at this for hours trying different
> configurations. LVM is not selected when installing either of the above
> machines as that seems to cause more problems.
>
> Many thanks,
> Dylan.
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