[Bug 942106] Re: software raid doesn't assemble before mount on boot

[Dmitrijs Ledkovs]

** Description changed:

- Booting a system with a software raid device can randomly or systematically
- fail.
+ [IMPACT]
  
- The system boot will fail at the initramfs stage and the system complain
- that it can't find the software raid device.
+  * Due to small time-outs udev may not detect all attached drives quick
+ enough to be processed and assembled into a RAID array
  
- The user ends up on the initramfs console. Rebooting might solve the issue
- (or not).
+ * This results in dropping a user into an initramfs shell or if
+ BOOT_DEGRADED is set the boot will proceed degrading RAID unnecessary
  
- ---
+  * The fix is to include wait_for_udev call to give udev more time to
+ find the drives which are part of RAID
  
- Happens at once on boot.
+ [TESTCASE]
  
- I happened to use the kernel 3.0.0-17, because the computer would not boot because of the bug that the line
- udevadm settle
- is missing in function degraded_arrays() in the file /usr/share/initramfs-tools/scripts/mdadm-functions which results in a halt on an initram fs console.
+  * Install RAID preferably with a "slow" interface, e.g. RAID1 with one
+ drive on external USB
  
- ---
+ * Reboot multiple times and notice that sometimes boot fails
  
- ProblemType: Crash
- Date: Mon Feb 27 17:46:23 2012
- ExecutablePath: /usr/bin/update-manager
- ExecutableTimestamp: 1326448883
- InterpreterPath: /usr/bin/python2.7
- ProcCmdline: /usr/bin/python ./xorg_fix_proprietary.py
- ProcCwd: /tmp/update-manager-Qp_QfE
- PythonArgs: ['/usr/bin/update-manager']
- Traceback:
-  Traceback (most recent call last):
-    File "./xorg_fix_proprietary.py", line 160, in <module>
-      if ver and apt_pkg.VersionCompare(ver, "2:1.5.0") > 0:
-  ValueError: _system not initialized
- UserGroups:
+ * Upgrade to the -proposed package
+ 
+ * Reboot multiple times and notice that boot fail less often
+ 
+ [Regression Potential]
+ 
+ * boot speed is decreased due to the nature of the fix, i.e. adding a physical delay
+ * Multiple reports in this bug and on the ubuntuforums reporting that this change "fixes" the boot issue for the users

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-manager in Ubuntu.
https://bugs.launchpad.net/bugs/942106

Title:
  software raid doesn't assemble before mount on boot

Status in “mdadm” package in Ubuntu:
  Fix Released
Status in “update-manager” package in Ubuntu:
  Fix Released
Status in “mdadm” source package in Precise:
  Confirmed
Status in “update-manager” source package in Precise:
  Fix Released
Status in “mdadm” source package in Quantal:
  Fix Released
Status in “update-manager” source package in Quantal:
  Fix Released

Bug description:
  [IMPACT]

   * Due to small time-outs udev may not detect all attached drives
  quick enough to be processed and assembled into a RAID array

  * This results in dropping a user into an initramfs shell or if
  BOOT_DEGRADED is set the boot will proceed degrading RAID unnecessary

   * The fix is to include wait_for_udev call to give udev more time to
  find the drives which are part of RAID

  [TESTCASE]

   * Install RAID preferably with a "slow" interface, e.g. RAID1 with
  one drive on external USB

  * Reboot multiple times and notice that sometimes boot fails

  * Upgrade to the -proposed package

  * Reboot multiple times and notice that boot fail less often

  [Regression Potential]

  * boot speed is decreased due to the nature of the fix, i.e. adding a physical delay
  * Multiple reports in this bug and on the ubuntuforums reporting that this change "fixes" the boot issue for the users

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/mdadm/+bug/942106/+subscriptions