[Bug 849923] Re: Random missing /dev entries for hard drives / udev problem ?

[Brian Murray]

The issue with using /dev/ entries for mounting disks is that they can
and do change.  Instead one should be using UUIDs as documented here
https://help.ubuntu.com/community/UsingUUID.

** Changed in: udev (Ubuntu)
       Status: New => Invalid

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Title:
  Random missing /dev entries for hard drives / udev problem ?

Status in “udev” package in Ubuntu:
  Invalid

Bug description:
  Hello.

  I'm facing a weird problem : yesterday, I could dynamically mount from
  Nautilus a partition who was not present in /etc/fstab. Today it's not
  possible anymore. The HDD is correctly detected (/dev/sdd), parted or
  cfdisk say ther is only 1 partition (that is correct), but when I try
  to mount /dev/sdd1 from command line, I get ther error "mount:
  périphérique spécial /dev/sdd1 n'existe pas" (in US : "special device
  /dev/sdd1 does not exist").

  I also ran into another weird problem last weekend, while installing
  Ubuntu 11.04 for a new-switching friend of mine. His brand new PC is
  an Acer Aspire X3910. Its hard drive is alternately detected as
  /dev/sda and /dev/sdc. It's not a big deal for daily use, but hardware
  monitoring tools such as hddtemp report rogue temperature (and for a
  good reason : try to read information from a non existent /dev entry
  !)

  These 2 problems lead me to imagine that there could be a problem with
  UDEV. I tried to write a static udev rule to fix the second issue, but
  I did not succeed (I'm quite a newbie for these sorts of thing !) If
  you, dear reader, are able to help me right now, feel free to do so
  and be greatly thanked in advance !

  Anyway, thanks a lot for reading AND producing a great system. I do
  prefer to face such difficulties than struggling with Windows !

  Best regards,

  Al.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: udev 167-0ubuntu3
  ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  NonfreeKernelModules: nvidia
  Architecture: amd64
  CustomUdevRuleFiles: 10-vboxdrv.rules
  Date: Wed Sep 14 14:01:24 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: Dell Inc. OptiPlex 755
  ProcEnviron:
   LANGUAGE=fr_FR:en
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-11-generic root=UUID=12948e11-71e0-4956-9a9d-5b32539fa1f8 ro quiet splash vt.handoff=7
  SourcePackage: udev
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/30/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A10
  dmi.board.name: 0GM819
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 6
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA10:bd04/30/2008:svnDellInc.:pnOptiPlex755:pvr:rvnDellInc.:rn0GM819:rvr:cvnDellInc.:ct6:cvr:
  dmi.product.name: OptiPlex 755
  dmi.sys.vendor: Dell Inc.

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