def _check_target_flavor(self, instance, flavor, block_device_info):
ephemerals = driver.block_device_info_get_ephemerals(block_device_info)
eph_size = (block_device.get_bdm_ephemeral_disk_size(ephemerals) or
instance.flavor.ephemeral_gb)
new_root_gb = flavor.root_gb
curr_root_gb = instance.flavor.root_gb
new_eph_size = flavor.ephemeral_gb
root_down = new_root_gb < curr_root_gb
ephemeral_down = new_eph_size < eph_size
booted_from_volume = self._block_dev_man.is_boot_from_volume(
block_device_info)
if root_down and not booted_from_volume:
raise exception.InstanceFaultRollback(
exception.CannotResizeDisk(
reason=_("Cannot resize the root disk to a smaller size. "
"Current size: %(curr_root_gb)s GB. Requested "
"size: %(new_root_gb)s GB.") % {
'curr_root_gb': curr_root_gb,
'new_root_gb': new_root_gb}))
# We allow having a new flavor with no ephemeral storage, in which
# case we'll just remove all the ephemeral disks.
elif ephemeral_down and new_eph_size:
reason = (_("The new flavor ephemeral size (%(flavor_eph)s) is "
"smaller than the current total ephemeral disk size: "
"%(current_eph)s.") %
dict(flavor_eph=flavor.ephemeral_gb,
current_eph=eph_size))
raise exception.InstanceFaultRollback(
exception.CannotResizeDisk(reason=reason))
def test_get_bdm_ephemeral_disk_size(self):
size = block_device.get_bdm_ephemeral_disk_size(self.new_mapping)
self.assertEqual(10, size)
def test_get_bdm_ephemeral_disk_size(self):
size = block_device.get_bdm_ephemeral_disk_size(self.new_mapping)
self.assertEqual(10, size)
