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# Copyright (C) 2013-2014 eNovance SAS <licensing@enovance.com>
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import os
import re
import sys
from hardware import detect_utils
from hardware import smart_utils
def sizeingb(size):
return int((size * 512) / (1000 * 1000 * 1000))
def disksize(name):
size = open('/sys/block/' + name + '/size').read(-1)
return sizeingb(int(size))
def disknames():
names = []
for name in os.listdir('/sys/block'):
if (name[1] == 'd' and name[0] in 'shv') or name.startswith('nvme'):
names.append(name)
return names
def get_disk_info(name, sizes, hw_lst):
hw_lst.append(('disk', name, 'size', str(sizes[name])))
info_list = ['device/vendor', 'device/model', 'device/rev',
'queue/optimal_io_size', 'queue/physical_block_size',
'queue/rotational', 'queue/nr_requests']
for info in info_list:
disk_sys_info = '/sys/block/%s/%s' % (name, info)
# revision can be explicitly named
if not os.path.exists(disk_sys_info) and info == 'device/rev':
info = 'device/revision'
# for nvme devices we can have a nested device dir
if not os.path.exists(disk_sys_info):
disk_sys_info = '/sys/block/%s/device/%s' % (name, info)
try:
with open(disk_sys_info, 'r') as dev:
hw_lst.append(('disk', name, info.split('/')[1],
dev.readline().rstrip('\n').strip()))
except Exception as exc:
sys.stderr.write(
'Failed retrieving disk information %s for %s: %s\n' % (
info, name, str(exc)))
try:
with open('/sys/block/%s/queue/scheduler' % name, 'r') as dev:
s_line = dev.readline().rstrip('\n').strip()
sched = re.findall(r'\[(.*?)\]', s_line)
if sched:
hw_lst.append(('disk', name, 'scheduler', sched[0]))
except Exception as exc:
sys.stderr.write('Cannot extract scheduler for disk %s: %s' % (
name, exc))
def get_disk_cache(name, hw_lst):
# WCE & RCD from sysfs
# https://www.kernel.org/doc/Documentation/scsi/sd-parameters.txt
device_path = '/sys/block/{0}/device'.format(name)
try:
_link_info = os.readlink(device_path)
_scsi_addr = _link_info.rsplit('/', 1)[1]
device_path = (device_path + '/scsi_disk/{0}/cache_type').format(
_scsi_addr)
with open(device_path, 'r') as cache_info:
my_text = cache_info.readline().rstrip('\n').strip()
_wce = '1'
_rcd = '0'
if my_text == 'write through':
_wce = '0'
elif my_text == 'none':
_wce = '0'
_rcd = '1'
elif 'daft' in my_text:
_rcd = '1'
hw_lst.append(('disk', name, 'Write Cache Enable', _wce))
hw_lst.append(('disk', name, 'Read Cache Disable', _rcd))
except Exception as exc:
sys.stderr.write(
'Failed at getting disk information at %s: %s\n' %
(device_path, str(exc)))
def get_disk_id(name, hw_lst):
# In some VMs, the disk-by id doesn't exists
if os.path.exists('/dev/disk/by-id/'):
for entry in os.listdir('/dev/disk/by-id/'):
idp = os.path.realpath('/dev/disk/by-id/' + entry).split('/')
if idp[-1] == name:
id_name = "id"
if entry.startswith('wwn'):
id_name = "wwn-id"
elif entry.startswith('scsi'):
id_name = "scsi-id"
hw_lst.append(('disk', name, id_name, entry))
def parse_hdparm_output(output):
res = output.split(' = ')
if len(res) != 2:
return 0.0
try:
mbsec = res[1].split(' ')[-2]
return float(mbsec)
except (ValueError, KeyError):
return 0.0
def diskperfs(names):
return dict((name, parse_hdparm_output(
detect_utils.cmd('hdparm -t /dev/%s' % name))) for name in names)
def disksizes(names):
return dict((name, disksize(name)) for name in names)
def detect():
"""Detect disks."""
hw_lst = []
names = disknames()
sizes = disksizes(names)
disks = [name for name, size in sizes.items() if size > 0]
hw_lst.append(('disk', 'logical', 'count', str(len(disks))))
for name in disks:
get_disk_info(name, sizes, hw_lst)
# nvme devices do not need standard cache mechanisms
if not name.startswith('nvme'):
get_disk_cache(name, hw_lst)
get_disk_id(name, hw_lst)
# smartctl support
# run only if smartctl command is there
if detect_utils.which("smartctl"):
if name.startswith('nvme'):
sys.stderr.write('Reading SMART for nvme\n')
smart_utils.read_smart_nvme(hw_lst, name)
else:
smart_utils.read_smart(hw_lst, "/dev/%s" % name)
else:
sys.stderr.write("Cannot find smartctl, exiting\n")
return hw_lst
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