Synnefo » snf-ganeti » ganeti-local

  def Grow(self, amount):

    """Grow the block device.

    Arguments:

      amount: the amount (in mebibytes) to grow with

    Returns: None

    """

    raise NotImplementedError

  def Grow(self, amount):

    """Grow the logical volume.

    """

    # we try multiple algorithms since the 'best' ones might not have

    # space available in the right place, but later ones might (since

    # they have less constraints); also note that only recent LVM

    # supports 'cling'

    for alloc_policy in "contiguous", "cling", "normal":

      result = utils.RunCmd(["lvextend", "--alloc", alloc_policy,

                             "-L", "+%dm" % amount, self.dev_path])

      if not result.failed:

        return

    raise errors.BlockDeviceError("Can't grow LV %s: %s" %

                                  (self.dev_path, result.output))

  def Grow(self, amount):

    """Resize the DRBD device and its backing storage.

    """

    if self.minor is None:

      raise errors.ProgrammerError("drbd8: Grow called while not attached")

    if len(self._children) != 2 or None in self._children:

      raise errors.BlockDeviceError("Cannot grow diskless DRBD8 device")

    self._children[0].Grow(amount)

    result = utils.RunCmd(["drbdsetup", self.dev_path, "resize"])

    if result.failed:

      raise errors.BlockDeviceError("resize failed for %s: %s" %

                                    (self.dev_path, result.output))

    return