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#
# 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 IOError:
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
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