Hello,

What about if on your vagrantfile you create a disk/filesystem for
what you require to store?

say /var/docker
or /srv or /project

will that work?

if the answer is yes, then you can put some Vagrant Vbox manage to
create a fixed size disk at virtualbox level and then using shell
provisioners you can do the OS part

let me know and I can share some tips for that.

if, using a mount point won't work for you, then I think the easiest
will be create a custom box using packer.io

using VBoxManage you can convert the disk to fixed before first boot, quite cool

here I create 3 disk after the OS one.

something similar can be used to change the OS disk into fixed

https://github.com/kikitux/packer-vagrant-oracle/blob/master/packer/oracle65/packer-vagrant-oracle65-btrfs-4disk.json

Alvaro

On Thu, Mar 26, 2015 at 9:33 PM, cheater00 <[email protected]> wrote:
> Hi,
> in my use the dynamically-allocated vmdk that Vagrant boxes use in
> conjunction with the Virtualbox provider make disk IO very sluggish. This is
> a typical workload for what I'm doing. I have manually converted a VM to use
> a fixed size VDI and the disk IO was much better. With the normal setup
> streaming disk IO would periodically freeze up the host operating system
> (which is a developer workstation so it's important it can be used while say
> test suites are running on the guest); IO would drop down to even 200 KB/sec
> according to iotop; I have good grounds to believe the CPU useage is due to
> Virtualbox itself because top on the host showed vb maxing out the cpu,
> whereas in the guest top showed an idle system. Upon conversion to a fixed
> size disk, disk IO was normal and used no cpu at all. This is a great
> deficiency. Me and my team have tried this on various operating systems and
> computers.
>
> Is there a way to tell Vagrant to provision with fixed sized VDIs (or VMDKs
> if that's possible)? I have not been able to find a good way to do this;
> what I currently do is I boot up the box first (it's the standard trusty64
> box), then attach a fixed size VDI, and run some scripts once it's booted
> that format the VDI, cp -arx from the original fs root to the new one (on a
> running system - I know it's "bad" but it works ok), and then swap the disks
> around. It's still a bit buggy but I'm getting there. It's a pretty crappy
> way of doing things, though.
>
> I cannot convert the vmdk to fixed size VDI because the VMDK in trusty64 is
> set to allow up to 40 gigabytes of size; I can only spare 8 gigabytes; the
> real size of the VMDK right after provisioning is 1.2 gigabytes.
>
> After all this stuff is done I start with the real provisioning process
> installing various software etc using Ansible.
>
> I hope someone can help me figure out a good way of doing this, because it's
> very cumbersome and fragile right now.
>
> Thanks!
>
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