1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
#
# mdraid.py
# mdraid functions
#
# Copyright (C) 2009 Red Hat, Inc. All rights reserved.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
# Author(s): Dave Lehman <dlehman@redhat.com>
#
import os
import iutil
from ..errors import *
import gettext
_ = lambda x: gettext.ldgettext("anaconda", x)
import logging
log = logging.getLogger("storage")
# raidlevels constants
RAID10 = 10
RAID6 = 6
RAID5 = 5
RAID1 = 1
RAID0 = 0
def getRaidLevels():
avail = []
try:
f = open("/proc/mdstat", "r")
except:
pass
else:
for l in f.readlines():
if not l.startswith("Personalities"):
continue
lst = l.split()
for lev in ["RAID0", "RAID1", "RAID5", "RAID6", "RAID10"]:
if "[" + lev + "]" in lst or "[" + lev.lower() + "]" in lst:
avail.append(lev)
f.close()
avail.sort()
return avail
raid_levels = getRaidLevels()
def isRaid(raid, raidlevel):
"""Return whether raidlevel is a valid descriptor of raid"""
raid_descriptors = {RAID10: ("RAID10", "10", 10),
RAID6: ("RAID6", "6", 6),
RAID5: ("RAID5", "5", 5),
RAID1: ("mirror", "RAID1", "1", 1),
RAID0: ("stripe", "RAID0", "0", 0)}
if raid in raid_descriptors:
return raidlevel in raid_descriptors[raid]
else:
raise ValueError, "invalid raid level %d" % raid
def get_raid_min_members(raidlevel):
"""Return the minimum number of raid members required for raid level"""
raid_min_members = {RAID10: 2,
RAID6: 4,
RAID5: 3,
RAID1: 2,
RAID0: 2}
for raid, min_members in raid_min_members.items():
if isRaid(raid, raidlevel):
return min_members
raise ValueError, "invalid raid level %d" % raidlevel
def get_raid_max_spares(raidlevel, nummembers):
"""Return the maximum number of raid spares for raidlevel."""
raid_max_spares = {RAID10: lambda: max(0, nummembers - get_raid_min_members(RAID10)),
RAID6: lambda: max(0, nummembers - get_raid_min_members(RAID6)),
RAID5: lambda: max(0, nummembers - get_raid_min_members(RAID5)),
RAID1: lambda: max(0, nummembers - get_raid_min_members(RAID1)),
RAID0: lambda: 0}
for raid, max_spares_func in raid_max_spares.items():
if isRaid(raid, raidlevel):
return max_spares_func()
raise ValueError, "invalid raid level %d" % raidlevel
def mdcreate(device, level, disks, spares=0):
argv = ["--create", device, "--run", "--level", str(level)]
raid_devs = len(disks) - spares
argv.append("--raid-devices=%d" % raid_devs)
if spares:
argv.append("--spare-devices=%d" % spares)
argv.extend(disks)
rc = iutil.execWithRedirect("mdadm",
argv,
stderr = "/dev/tty5",
stdout = "/dev/tty5",
searchPath=1)
if rc:
raise MDRaidError("mdcreate failed for %s" % device)
# mdadm insists on starting the new array, so we have to stop it here
#self.mddeactivate(device)
def mddestroy(device):
rc = iutil.execWithRedirect("mdadm",
["--zero-superblock", device],
stderr = "/dev/tty5",
stdout = "/dev/tty5",
searchPath=1)
if rc:
raise MDRaidError("mddestroy failed for %s" % device)
def mdadd(device):
rc = iutil.execWithRedirect("mdadm",
["--incremental",
"--quiet",
"--auto=md",
device],
stderr = "/dev/tty5",
stdout = "/dev/tty5",
searchPath=1)
if rc:
raise MDRaidError("mdadd failed for %s" % device)
def mdactivate(device, members=[], super_minor=None, uuid=None):
if super_minor is None and not uuid:
raise ValueError("mdactivate requires either a uuid or a super-minor")
if uuid:
identifier = "--uuid=%s" % uuid
elif super_minor is not None:
identifier = "--super-minor=%d" % super_minor
else:
identifier = ""
rc = iutil.execWithRedirect("mdadm",
["--assemble",
device,
identifier,
"--auto=md",
"--update=super-minor"] + members,
stderr = "/dev/tty5",
stdout = "/dev/tty5",
searchPath=1)
if rc:
raise MDRaidError("mdactivate failed for %s" % device)
def mddeactivate(device):
rc = iutil.execWithRedirect("mdadm",
["--stop", device],
stderr = "/dev/tty5",
stdout = "/dev/tty5",
searchPath=1)
if rc:
raise MDRaidError("mddeactivate failed for %s" % device)
def mdexamine(device):
# XXX NOTUSED: we grab metadata from udev, which ran 'mdadm -E --export'
#
# FIXME: this will not work with version >= 1 metadata
#
# We should use mdadm -Eb or mdadm -E --export for a more easily
# parsed output format.
lines = iutil.execWithCapture("mdadm",
["--examine", device],
stderr="/dev/tty5").splitlines()
info = {
'major': "-1",
'minor': "-1",
'uuid' : "",
'level': -1,
'nrDisks': -1,
'totalDisks': -1,
'mdMinor': -1,
}
for line in lines:
(key, sep, val) = line.strip().partition(" : ")
if not sep:
continue
if key == "Version":
(major, sep, minor) = val.partition(".")
info['major'] = major
info['minor'] = minor
elif key == "UUID":
info['uuid'] = val.split()[0]
elif key == "Raid Level":
info['level'] = int(val[4:])
elif key == "Raid Devices":
info['nrDisks'] = int(val)
elif key == "Total Devices":
info['totalDisks'] = int(val)
elif key == "Preferred Minor":
info['mdMinor'] = int(val)
else:
continue
if not info['uuid']:
raise MDRaidError("UUID missing from device info")
return info
|
