I installed a SAIO(swift all in one) in my server, it's a ubuntu 14.04 system.
I create a loopback device for storage by following commands:
sudo mkdir /srv
sudo truncate -s 20GB /srv/swift-disk
sudo mkfs.xfs /srv/swift-disk
(http://docs.openstack.org/developer/swift/development_saio.html)
Now, I don't have enough disk to storage, I want to extand swift storage, what can I do for it?