Fedora installer support of dmraid ?
Lin, Weichuan
weichuan.lin at intel.com
Tue Aug 23 01:58:19 UTC 2005
Hi All
I have a machine with chips of silicon image 3114 and ICH7R on the
motherboard [I can choose one of them to connect the hard disk], and two
SATA hard disks, I am going to enable one of this chips at Fedora
installation stage. What I have done is copy the dmraid static link
version to stage2.img of anaconda, and patched the patch below to
anaconda. This patch is gotten from the mail list of anaconda; I just
changed the regular expression match [parameter of re.match()] to meet
the actual output of the dmraid on my machine. After done this, I can
choose the device of /dev/mapper/sil* to slice partition for
installation. But the operation of parted always fails, I have trace
into the program, and find that ped_disk_commit_to_os() failed due to
failure of ioctl with BLKPG request. The error is reported as Invalid
argument, then an exception is thrown in function of
_blkpg_add_partition(). The installation procedure has to hang due to
this failure.
On the other hand, if I use parted on an installed system to slice
partition on /dev/mapper/sil* created by dmraid, parted also complains
that he can't notify to the system about the change of the disk
partition. If I connect the hard disks to the ICH7R chips, the dmraid
even can't create /dev/mapper/isw*. With -tay option, dmraid told me
that the GROUP ok, but the device can't be seen under /dev/mapper.
I have interest on enabling raid support at fedora installer, and have
learned that the work is in progress through paper of Heinz on OLS 2005,
but I am not very clear about the stage of the progress. And from the
brief introduction at the end of the paper, the architecture is very
different from what I think; could anyone tell me where can I get more
detail about the current status of the installer support and the
software architecture?
Here is the patch provided by Wormgoor, with a little change of regular
expression match and argument.
+# dmraid.py - dmraid probing
+#
+# Mark Wormgoor <mark wormgoor com>
+#
+# Copyright 2004 Mark Wormgoor
+#
+# This software may be freely redistributed under the terms of the GNU
+# general public license.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+import iutil
+import os
+import re
+
+from constants import *
+
+output = "/tmp/dmraidout"
+
+dmraidDevicePresent = 0
+
+def has_dmraid():
+ global dmraidDevicePresent
+
+ if not (os.access("/usr/sbin/dmraid", os.X_OK) or
+ os.access("/sbin/dmraid", os.X_OK)):
+ return
+
+ rc = iutil.execWithRedirect("dmraid",
+ ["dmraid", "-ay"],
+ stdout = output,
+ stderr = output,
+ searchPath = 1)
+ if rc:
+ dmraidDevicePresent = 0
+ else:
+ dmraidDevicePresent = 1
+
+ return dmraidDevicePresent
+# now check to see if dmraid is available
+has_dmraid()
+
+
+def disklist():
+ global dmraidDevicePresent
+ if dmraidDevicePresent == 0:
+ return []
+
+ disks = []
+ args = ["dmraid", "-vay"]
+ dmraidscanout = iutil.execWithCapture(args[0], args, searchPath =
1,
+ stderr = "/dev/tty6")
+ for line in dmraidscanout.split("\n"):
+ try:
+ found = re.match("/dev/(\S+)", line)
+ disks.append (found.group(1))
+ except:
+ pass
+
+ return disks
+
+def setlist():
+ global dmraidDevicePresent
+ if dmraidDevicePresent == 0:
+ return []
+
+ sets = []
+ args = ["dmraid", "-vay"]
+ dmraidscanout = iutil.execWithCapture(args[0], args, searchPath =
1,
+ stderr = "/dev/tty6")
+ for line in dmraidscanout.split("\n"):
+ try:
+ found = re.match("INFO: added /dev/(\S+) to RAID set
\"(\S+)\"", line)
+ sets.append (found.group(2))
+ except:
+ pass
+
+ return sets
diff -ruN mnt/usr/lib/anaconda/isys.py new/usr/lib/anaconda/isys.py
--- mnt/usr/lib/anaconda/isys.py 1970-01-01 01:00:00.000000000
+0100
+++ new/usr/lib/anaconda/isys.py 2004-10-10 21:06:58.000000000
+0200
@@ -20,6 +20,7 @@
import os
import os.path
import posix
+import dmraid
import sys
import kudzu
@@ -288,6 +289,20 @@
dict = driveDict("disk")
+ # first, figure out the dmraid devices
+ if dmraid.has_dmraid():
+ disks = dmraid.disklist()
+ if len(disks) > 0:
+ for disk in disks:
+ try:
+ del dict[disk]
+ except:
+ pass
+ sets = dmraid.setlist()
+ if len (sets) > 0:
+ for set in sets:
+ dict["mapper/" + set] = "DMRAID"
+
# this is kind of ugly, but it's much easier to do this from python
for (dev, descr) in dict.items():
# the only raid devs like this are ide, so only worry about
them
@@ -391,14 +406,28 @@
def makeDevInode(name, fn=None):
if fn:
- _isys.mkdevinode(name, fn)
- return fn
+ if name[:7] == "mapper/":
+ try:
+ os.makedirs(os.path.dirname(fn))
+ except:
+ pass
+ os.symlink("/dev/" + name, fn)
+ else:
+ _isys.mkdevinode(name, fn)
+ return fn
path = '/dev/%s' % (name,)
try:
os.stat(path)
except OSError:
path = '/tmp/%s' % (name,)
- _isys.mkdevinode(name, path)
+ if name[:7] == "mapper/":
+ try:
+ os.makedirs(os.path.dirname(path))
+ except:
+ pass
+ os.symlink("/dev/" + name, path)
+ else:
+ _isys.mkdevinode(name, path)
return path
def makedev(major, minor):
@@ -674,9 +703,12 @@
os.unlink("/tmp/cdrom")
def driveIsRemovable(device):
+ # DMRaid is always non-removable
# assume ide if starts with 'hd', and we don't have to create
# device beforehand since it just reads /proc/ide
- if device[:2] == "hd":
+ if device[:7] == "mapper/":
+ rc = 0
+ elif device[:2] == "hd":
rc = (_isys.isIdeRemovable("/dev/"+device) == 1)
else:
makeDevInode(device, "/tmp/disk")
diff -ruN mnt/usr/lib/anaconda/mknod-stub
new/usr/lib/anaconda/mknod-stub
--- mnt/usr/lib/anaconda/mknod-stub 1970-01-01 01:00:00.000000000
+0100
+++ new/usr/lib/anaconda/mknod-stub 2004-10-10 21:06:58.000000000
+0200
@@ -25,8 +25,9 @@
# inode
while (drive.find('/') != -1):
if (drive.startswith("cciss") or drive.startswith("ida") or
- drive.startswith("rd") or drive.startswith("ataraid")
- or drive.startswith("iseries") or
drive.startswith("i2o")):
+ drive.startswith("rd") or drive.startswith("ataraid")
or
+ drive.startswith("mapper") or
drive.startswith("iseries") or
+ drive.startswith("i2o")):
break
drive = drive[drive.find('/') + 1:]
isys.makeDevInode(drive, path)
diff -ruN mnt/usr/lib/anaconda/partedUtils.py
new/usr/lib/anaconda/partedUtils.py
--- mnt/usr/lib/anaconda/partedUtils.py 1970-01-01 01:00:00.000000000
+0100
+++ new/usr/lib/anaconda/partedUtils.py 2004-10-10 21:06:58.000000000
+0200
@@ -117,6 +117,9 @@
or partition.geom.dev.type == parted.DEVICE_CPQARRAY):
return "%sp%d" % (partition.geom.dev.path[5:],
partition.num)
+ elif partition.geom.dev.path[5:12] == "mapper/":
+ return "%s_p%d" % (partition.geom.dev.path[5:],
+ partition.num)
return "%s%d" % (partition.geom.dev.path[5:],
partition.num)
diff -ruN mnt/usr/lib/anaconda/raid.py new/usr/lib/anaconda/raid.py
--- mnt/usr/lib/anaconda/raid.py 1970-01-01 01:00:00.000000000
+0100
+++ new/usr/lib/anaconda/raid.py 2004-10-10 21:06:58.000000000
+0200
@@ -38,6 +38,9 @@
raidDevices = {}
for d in drives:
+ # Assume dmraid is not part of a md raidset
+ if d[:7] == "mapper/":
+ continue
parts = []
isys.makeDevInode(d, "/tmp/" + d)
try:
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