[virt-tools-list] virt-install: zero allocation on lvm volumes

[Cole Robinson]

On 10/02/2012 04:30 PM, Doug Goldstein wrote:
> On Tue, Oct 2, 2012 at 12:16 PM, Guido Günther <agx at sigxcpu.org> wrote:
>> Hi,
>> creating a vm with a virtual disk in an lvm pool e.g. via:
>>
>> virt-install --disk=pool=vm_test,size=3.0 ...
>>
>> results in (from libvirtd's log):
>>
>> virCommandWait:2332 : internal error Child process (/sbin/lvcreate --name test01.img -L 0K --virtualsize 3145728K vg_vm_test) unexpected exit status 5:   Unable to create new logical volume with no extents
>>
>> However using
>>
>> virt-install --disk=pool=vm_test,size=3.0,sparce=false ...
>>
>> works. I wonder what's the correct place to make sure we don't try to
>> create LVM volumes with a zero allocation by default?
>> Cheers,
>>  -- Guido
> 
> I actually very recently brought this up on libvirt's IRC channel. The
> question is do we want to disallow sparse allocations on LVM entirely?
> Or just some small percentage be allocated and then grow to the
> correct size. I feel the correct place to fix this is within libvirt
> itself.
> 

Fedora 18 had a bug filed about this:

https://bugzilla.redhat.com/show_bug.cgi?id=866481

I just sent a libvirt patch that turns lvm allocation=0 into allocation=1 at
lvcreate time:

https://www.redhat.com/archives/libvir-list/2012-October/msg00857.html

- Cole