class LvmVolume(resources.LogicalDriveSlice):
# Q: Why is this identified by LV UUID and VG UUID rather than just
# LV UUID? Isn't the LV UUID unique enough?
# A: We're matching LVM2's behaviour. If you e.g. imagine a machine that
# has some VGs and LVs, then if you want to disambiguate them you run
# 'vgchange -u' to get a new VG UUID. However, there is no equivalent
# command to reset LV uuid, because LVM finds two LVs with the same UUID
# in VGs with different UUIDs to be unique enough.
class Meta:
identifier = GlobalId("uuid", "vg")
icon = "lvm_lv"
label = "Logical volume"
vg = attributes.ResourceReference()
uuid = attributes.Uuid()
name = attributes.String()
def get_label(self):
return "%s-%s" % (self.vg.name, self.name)
""" This has to be a class method today because at the point we call it we only has the type not the object"""
@classmethod
def device_type(cls):
return "lvm_volume"
def test_uuid(self):
u = attributes.Uuid()
u.validate('BACBE363-A1D4-4C1A-9A08-5B47DE17AB73')
u.validate('BACBE363A1D44C1A9A085B47DE17AB73')
with self.assertRaises(ValueError):
u.validate('deadbeef')
self.assertEqual(u.cast('BACBE363A1D44C1A9A085B47DE17AB73'), 'BACBE363A1D44C1A9A085B47DE17AB73')
class Disk(resources.PhysicalDisk):
class Meta:
identifier = GlobalId('wwid')
lun = attributes.ResourceReference(optional=True)
size = attributes.Bytes()
wwid = attributes.Uuid()
read_bytes_sec = statistics.Gauge(units="B/s", label="Read bandwidth")
write_bytes_sec = statistics.Gauge(units="B/s", label="Write bandwidth")
class LvmGroup(resources.StoragePool):
class Meta:
identifier = GlobalId("uuid")
icon = "lvm_vg"
label = "Volume group"
uuid = attributes.Uuid()
name = attributes.String()
size = attributes.Bytes()
def get_label(self):
return self.name