def lvm_capacity():
"""
Return the total LVM capacity in bytes
"""
lines = execute('vgdisplay', 'lunr-volume', units='b')
for line in lines.split('\n'):
# Find the Volume Group Size in the output
if re.search('VG Size', line):
# First convert the bytes to GiB, then round down (trunc)
# Then convert back to bytes. Do this because lunr/cinder
# stores the size as an integer not a float
return bytes_to_gibibytes(int(line.split()[2]))
def node(helper):
"""
Report any storage capacity and useage inconsistencies between the
storage node and the API
"""
# Get a list of active LVM Volumes
lvs = [lv for lv in helper.volumes._scan_volumes()
if lv['origin'] == '']
# Get our node id
node_id = request(helper, 'nodes?name=%s' % helper.name)
# Fetch all information about our node
node = request(helper, 'nodes/%s' % node_id[0]['id'])
def msg(_msg):
return {'node': node['id'], 'msg': _msg}
# Calculate total space used by volumes
space_used = 0
for lv in lvs:
space_used += bytes_to_gibibytes(lv['size'])
# API should report the same used and available space
if node['storage_used'] != space_used:
return msg("API storage_used is inconsistent with node (%s != %s)"
% (node['storage_used'], space_used))
# Ask the hardware how much capacity it has
total_capacity = lvm_capacity()
# Compare total capacity with lunr api capacity numbers
if total_capacity != node['size']:
return msg("API 'size' is inconsistent with storage node (%s != %s)"
% (node['size'], total_capacity))
# Available storage should match also
storage_free = total_capacity - space_used
if storage_free != node['storage_free']:
return msg("API 'storage_free' is inconsistent with storage node "
" (%s != %s)" % (node['storage_free'], storage_free))