def _create_logical_volume(self, size):
"""Creates a logical volume with a minimum size.
:param size: size of the logical volume in bytes
:returns: string -- the name of the new logical volume.
:raises: PowerVMNoSpaceLeftOnVolumeGroup
"""
vgs = self.run_vios_command(self.command.lsvg())
cmd = self.command.lsvg('%s -field vgname freepps -fmt :' %
' '.join(vgs))
output = self.run_vios_command(cmd)
found_vg = None
# If it's not a multiple of 1MB we get the next
# multiple and use it as the megabyte_size.
megabyte = 1024 * 1024
if (size % megabyte) != 0:
megabyte_size = int(size / megabyte) + 1
else:
megabyte_size = size / megabyte
# Search for a volume group with enough free space for
# the new logical volume.
for vg in output:
# Returned output example: 'rootvg:396 (25344 megabytes)'
match = re.search(r'^(\w+):\d+\s\((\d+).+$', vg)
if match is None:
continue
vg_name, avail_size = match.groups()
if megabyte_size <= int(avail_size):
found_vg = vg_name
break
if not found_vg:
LOG.error(
_('Could not create logical volume. '
'No space left on any volume group.'))
raise exception.PowerVMNoSpaceLeftOnVolumeGroup()
cmd = self.command.mklv('%s %sB' % (found_vg, size / 512))
lv_name = self.run_vios_command(cmd)[0]
return lv_name
def fake_create_logical_volume(size):
raise exception.PowerVMNoSpaceLeftOnVolumeGroup()
