bhyve VM drive size limit?

[Allan Jude]

On 2017-09-02 10:52, Ruben wrote:
> 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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> 

To understand why space in a ZVOL goes missing, research 'raidz padding'.

See here:
https://www.delphix.com/blog/delphix-engineering/zfs-raidz-stripe-width-or-how-i-learned-stop-worrying-and-love-raidz

For more detail, see Chapter 9 of "FreeBSD Mastery: Advanced ZFS" from
http://www.zfsbook.com


-- 
Allan Jude

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