Synnefo » snf-ganeti » ganeti-local

# Copyright (C) 2006, 2007, 2010, 2012, 2013 Google Inc.

import random

from ganeti import compat

from ganeti import errors

from ganeti import objects

class TestExclusiveStoragePvs(unittest.TestCase):

  """Test cases for functions dealing with LVM PV and exclusive storage"""

  # Allowance for rounding

  _EPS = 1e-4

  _MARGIN = constants.PART_MARGIN + constants.PART_RESERVED + _EPS

  @staticmethod

  def _GenerateRandomPvInfo(rnd, name, vg):

    # Granularity is .01 MiB

    size = rnd.randint(1024 * 100, 10 * 1024 * 1024 * 100)

    if rnd.choice([False, True]):

      free = float(rnd.randint(0, size)) / 100.0

    else:

      free = float(size) / 100.0

    size = float(size) / 100.0

    attr = "a-"

    return objects.LvmPvInfo(name=name, vg_name=vg, size=size, free=free,

                             attributes=attr)

  def testGetStdPvSize(self):

    """Test cases for bdev.LogicalVolume._GetStdPvSize()"""

    rnd = random.Random(9517)

    for _ in range(0, 50):

      # Identical volumes

      pvi = self._GenerateRandomPvInfo(rnd, "disk", "myvg")

      onesize = bdev.LogicalVolume._GetStdPvSize([pvi])

      self.assertTrue(onesize <= pvi.size)

      self.assertTrue(onesize > pvi.size * (1 - self._MARGIN))

      for length in range(2, 10):

        n_size = bdev.LogicalVolume._GetStdPvSize([pvi] * length)

        self.assertEqual(onesize, n_size)

      # Mixed volumes

      for length in range(1, 10):

        pvlist = [self._GenerateRandomPvInfo(rnd, "disk", "myvg")

                  for _ in range(0, length)]

        std_size = bdev.LogicalVolume._GetStdPvSize(pvlist)

        self.assertTrue(compat.all(std_size <= pvi.size for pvi in pvlist))

        self.assertTrue(compat.any(std_size > pvi.size * (1 - self._MARGIN)

                                   for pvi in pvlist))

        pvlist.append(pvlist[0])

        p1_size = bdev.LogicalVolume._GetStdPvSize(pvlist)

        self.assertEqual(std_size, p1_size)

  def testComputeNumPvs(self):

    """Test cases for bdev.LogicalVolume._ComputeNumPvs()"""

    rnd = random.Random(8067)

    for _ in range(0, 1000):

      pvlist = [self._GenerateRandomPvInfo(rnd, "disk", "myvg")]

      lv_size = float(rnd.randint(10 * 100, 1024 * 1024 * 100)) / 100.0

      num_pv = bdev.LogicalVolume._ComputeNumPvs(lv_size, pvlist)

      std_size = bdev.LogicalVolume._GetStdPvSize(pvlist)

      self.assertTrue(num_pv >= 1)

      self.assertTrue(num_pv * std_size >= lv_size)

      self.assertTrue((num_pv - 1) * std_size < lv_size * (1 + self._EPS))

  def testGetEmptyPvNames(self):

    """Test cases for bdev.LogicalVolume._GetEmptyPvNames()"""

    rnd = random.Random(21126)

    for _ in range(0, 100):

      num_pvs = rnd.randint(1, 20)

      pvlist = [self._GenerateRandomPvInfo(rnd, "disk%d" % n, "myvg")

                for n in range(0, num_pvs)]

      for num_req in range(1, num_pvs + 2):

        epvs = bdev.LogicalVolume._GetEmptyPvNames(pvlist, num_req)

        epvs_set = compat.UniqueFrozenset(epvs)

        if len(epvs) > 1:

          self.assertEqual(len(epvs), len(epvs_set))

        for pvi in pvlist:

          if pvi.name in epvs_set:

            self.assertEqual(pvi.size, pvi.free)

          else:

            # There should be no remaining empty PV when less than the

            # requeste number of PVs has been returned

            self.assertTrue(len(epvs) == num_req or pvi.free != pvi.size)