I have some questions regarding the VM deployment through OS template...

1. I have imported centos template from openstack glance (the actual size of the template is 16GB but used is 1GB)...now my question is if i deploy the new VM with this template,the process will copy the whole 16GB or just 1 GB to create the new VM ??

2. I find disk size can not modify at the time of VM provisioning,is there any way to modify the VM disk size ?? 

Thanks,

Punit