Synnefo » snf-ganeti

  def GetSyncStatus(self):

    """Returns the sync status of the device.

    If this device is a mirroring device, this function returns the

    status of the mirror.

    Returns:

     (sync_percent, estimated_time, is_degraded)

    For logical volumes, sync_percent and estimated_time are always

    None (no recovery in progress, as we don't handle the mirrored LV

    case).

    For the is_degraded parameter, we check if the logical volume has

    the 'virtual' type, which means it's not backed by existing

    storage anymore (read from it return I/O error). This happens

    after a physical disk failure and subsequent 'vgreduce

    --removemissing' on the volume group.

    """

    result = utils.RunCmd(["lvs", "--noheadings", "-olv_attr", self.dev_path])

    if result.failed:

      logger.Error("Can't display lv: %s" % result.fail_reason)

      return None, None, True

    out = result.stdout.strip()

    # format: type/permissions/alloc/fixed_minor/state/open

    if len(out) != 6:

      return None, None, True

    is_degraded = out[0] == 'v' # virtual volume, i.e. doesn't have

                                # backing storage

    return None, None, is_degraded