def mdcreate(mdname, level, devices, metadata='default'):
mds = mddisplay()
# check if md device already exists
if next((x for x in mds if x['name'] == mdname), False):
raise errors.MDAlreadyExistsError(
'Error while creating md: md %s already exists' % mdname)
# check if level argument is valid
supported_levels = ('0', '1', 'raid0', 'raid1', 'stripe', 'mirror')
if level not in supported_levels:
raise errors.MDWrongSpecError('Error while creating md device: '
'level must be one of: %s' %
', '.join(supported_levels))
# check if all necessary devices exist
if not set(devices).issubset(
set([bd['device'] for bd in hu.list_block_devices(disks=False)])):
raise errors.MDNotFoundError(
'Error while creating md: at least one of devices is not found')
# check if devices are not parts of some md array
if set(devices) & set(
itertools.chain.from_iterable(md.get('devices', [])
for md in mds)):
raise errors.MDDeviceDuplicationError(
'Error while creating md: at least one of devices is '
'already in belongs to some md')
# FIXME: mdadm will ask user to continue creating if any device appears to
# be a part of raid array. Superblock zeroing helps to avoid that.
for device in devices:
mdclean(device)
utils.execute('mdadm',
'--create',
'--force',
mdname,
'-e',
metadata,
'--level=%s' % level,
'--raid-devices=%s' % len(devices),
*devices,
check_exit_code=[0])
def mdcreate(mdname, level, device, *args):
mds = mddisplay()
# check if md device already exists
if filter(lambda x: x['name'] == mdname, mds):
raise errors.MDAlreadyExistsError(
'Error while creating md: md %s already exists' % mdname)
# check if level argument is valid
supported_levels = ('0', '1', 'raid0', 'raid1', 'stripe', 'mirror')
if level not in supported_levels:
raise errors.MDWrongSpecError('Error while creating md device: '
'level must be one of: %s' %
', '.join(supported_levels))
devices = [device] + list(args)
# check if all necessary devices exist
if not set(devices).issubset(
set([bd['device'] for bd in hu.list_block_devices(disks=False)])):
raise errors.MDNotFoundError(
'Error while creating md: at least one of devices is not found')
# check if devices are not parts of some md array
if set(devices) & \
set(reduce(lambda x, y: x + y,
[md.get('devices', []) for md in mds], [])):
raise errors.MDDeviceDuplicationError(
'Error while creating md: at least one of devices is '
'already in belongs to some md')
#FIXME: mdadm will ask user to continue creating if any device appears to
# be a part of raid array. Superblock zeroing helps to avoid that.
map(mdclean, devices)
utils.execute('mdadm',
'--create',
'--force',
mdname,
'-e0.90',
'--level=%s' % level,
'--raid-devices=%s' % len(devices),
*devices,
check_exit_code=[0])
def add_spare(self, device):
if device in self.devices or device in self.spares:
raise errors.MDDeviceDuplicationError(
'Error while attaching device to md: '
'device %s is already attached' % device)
self.spares.append(device)