def __clearDisks(self, hasMultipath):
"""
Clears all disks of the system. This cleaning will erase ALL DATA of the
disks. There is no step back.
@rtype: None
@return: Nothing
"""
try:
# bug 109358: try to stop all raid partitions. it should be done first
# in a scenario where there is a LVM on top of a SW RAID. However, in
# a opposite way (RAID on top of LVM) it will fail. So we just let pass
# any exception from sw raid.
try:
raid.stop()
except:
pass
# delete LVM entities before partitioning
self.__logger.info('Deleting LVM entities...')
self.__logger.debug('PV Delete List: %s' % str(self.__pvDeleteList))
self.__logger.debug('VG Delete List: %s' % str(self.__vgDeleteList))
self.__logger.debug('LV Delete List: %s' % str(self.__lvDeleteList))
lvm.delLvmEntities(self.__pvDeleteList,
self.__vgDeleteList,
self.__lvDeleteList)
# stop LVM volume groups to avoid problems with disks partitioning
self.__logger.info('Stopping LVM...')
lvm.stop()
# Bug 109358: if SW RAID is on top a LVM we can stop it safetly now
# because LVM was just stopped above. If any problem happens from now
# on we need to let the exception raises above.
raid.stop()
except PKVMError as e:
raise
except Exception as e:
self.__logger.critical("Unexpected error")
self.__logger.critical("EXCEPTION:" + str(type(e)))
self.__logger.critical(str(e))
self.__logger.critical("Stacktrace:" + str(traceback.format_exc()))
raise PKVMError("PARTITIONER", "ERROR", "ERROR")
# perform custom setup for multipath devices
self.__logger.info('Performing custom multipath configuration...')
self.__logger.debug('Has multipath = %s' % str(hasMultipath))
tolerantMode = multipath.setup(hasMultipath,
bool(len(self.__lvmCommands)),
bool(len(self.__raidCommands)),
self.__tolerantMode)
# wait for udev to handle all events
run(CMD_UDEV_SETTLE)
def __createRAIDArrays(self):
"""
Calls required methods to create RAID arrays on system.
@rtype: None
@return: Nothing
"""
# start RAID arrays to work on them again
raid.start()
# create RAID arrays
raid.createArrays(self.__raidCommands)
# wait for RAID arrays to become clean
raid.wait(self.__raidCommands)
# stop RAID arrays to avoid any problems later
raid.stop()
def _reReadPartitionTable(disk, hasMultipath = False):
"""
Asks the kernel to re-read the partition table before trying
to format it
@type disk: basestring
@param disk: disk device name
@type hasMultipath: bool
@param hasMultipath: info about multipath on machine
@rtype: bool
@return: True if partition table sync successfull. False otherwise
"""
# give some opportunities to sync the partition table before
# returning false
for i in range(1, MAX_SYNC_ATTEMPTS):
# log the number of attempts
llecho('Re-reading partition table for %s (try %d)' % (disk, i))
# wait 1 second
time.sleep(1)
# FIXME: during the attempt to read the partitions, raid should
# be inactive or it will block devices belonging to its array
# and will make the next command to fail. It is not clear why
# raid becomes active here since is has been stopped in
# manage_parts. It demands further investigation.
if hasMultipath:
raid.stop()
# partition table re-read successfully: return success
if run(CMD_HDPARM_Z % disk) == 0:
return True
return False
