[Bug 1488688] Re: partprobe fails on /dev/mapper/353333330000007d0

[Loic Dachary]

Hi,

Thanks for investigating this issue. It fails the multipath
implementation for Ceph. In the case of multipath the partition must be
created on /dev/mapper/XXX otherwise it's kind of pointless ;-)

When you write "I can confirm that this still applies to Xenial." do you
mean that repeating the steps in the description leads to

lrwxrwxrwx 1 root root 7 Aug 25 23:00 353333330000007d0 -> ../dm-0
brw-rw---- 1 root disk 252, 1 Aug 25 23:00 353333330000007d0-part2
brw-rw---- 1 root disk 252, 2 Aug 25 23:00 353333330000007d0p2
crw------- 1 root root 10, 236 Aug 25 11:45 control

as well ?

Thanks again :-)

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https://bugs.launchpad.net/bugs/1488688

Title:
  partprobe fails on /dev/mapper/353333330000007d0

Status in multipath-tools package in Ubuntu:
  Triaged

Bug description:
  Steps to reproduce on Ubuntu 14.04 on a virtual machine with no
  /dev/sda device

  # apt-get install linux-image-extra-3.13.0-61-generic
  # modprobe scsi_debug vpd_use_hostno=0 add_host=1 dev_size_mb=200
  # ls -l /dev/mapper
  total 0
  lrwxrwxrwx 1 root root        7 Aug 25 23:00 353333330000007d0 -> ../dm-0
  crw------- 1 root root  10, 236 Aug 25 11:45 control
  # /sbin/sgdisk --new=2:0:100M --change-name=2:'ceph journal' --partition-guid=2:a94ad65f-fadb-4178-851b-5261c06ee3b9 --typecode=2:45b0969e-8ae0-4982-bf9d-5a8d867af560 --mbrtogpt -- /dev/mapper/353333330000007d0
  Warning: The kernel is still using the old partition table.
  The new table will be used at the next reboot.
  The operation has completed successfully.
  # partprobe /dev/mapper/353333330000007d0
  Device /dev/mapper/353333330000007d0p2 not found
  device-mapper: table ioctl on  failed: No such device or address
  Device /dev/mapper/353333330000007d0p2 not found
  device-mapper: table ioctl on  failed: No such device or address
  # ls -l /dev/mapper
  total 0
  lrwxrwxrwx 1 root root        7 Aug 25 23:00 353333330000007d0 -> ../dm-0
  brw-rw---- 1 root disk 252,   2 Aug 25 23:00 353333330000007d0p2
  crw------- 1 root root  10, 236 Aug 25 11:45 control
  # partprobe /dev/mapper/353333330000007d0
  # ls -l /dev/mapper
  total 0
  lrwxrwxrwx 1 root root        7 Aug 25 23:00 353333330000007d0 -> ../dm-0
  brw-rw---- 1 root disk 252,   1 Aug 25 23:00 353333330000007d0-part2
  brw-rw---- 1 root disk 252,   2 Aug 25 23:00 353333330000007d0p2
  crw------- 1 root root  10, 236 Aug 25 11:45 control

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