[Bug 1427859] Comment bridged from LTC Bugzilla

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------- Comment From hellerda at us.ibm.com 2015-03-11 16:16 EDT-------
Hi Mauricio,

Thanks for your detailed analysis, but I think we already knew this:
that the separator was an issue, that you have submitted patches to
Ubuntu to resolve it; that we still don't know (per LP 1430074) whether
we'll end up with the 'p' separator or the '-path' separator when it all
shakes out.  And understood, most of the real issues are in udev (and
the installer), which actually affect which device nodes are created and
removed.

That's why the focus of this bug was intended to be just the
inconsistency in the way the tools report.  And I think your comments
above confirm that the default output does *not* match the device nodes
as they actually exist.

Again: this is a cosmetic issue and so not a hot bug.  But I'd like to
keep it open until the "separator" issues are resolved.  If we end up
with -part, there may be no work required at all.  But if we go with 'p'
as you are proposing... then I'd like to see if Canonical is willing to
fix the tools so they accurately reflect the device nodes as exist, as
they seem to do for devices other than mpath.

If you strongly disagree I'll leave it closed.  Otherwise I'd like to
reopen.  Give me your thoughts, please.  Thanks for all your work here!

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https://bugs.launchpad.net/bugs/1427859

Title:
  ISST-SAN:Need a common format for partition listing using
  kpartx,fdisk.distrib and ls -l

Status in multipath-tools package in Ubuntu:
  New

Bug description:
  == Comment: #0 - LEKSHMI C. PILLAI <lekshmi.cpillai at in.ibm.com> - 2015-02-25 09:02:18 ==
  This is a KVM guest with Ubuntu 15.04.

  I am facing issues with format with partition listing using different
  commands

  In zap06 I created partitions on mpath29 using fdisk.distrib

  Before partition creation:

  root at zap06:/dev/mapper# fdisk.distrib  -l /dev/mapper/mpath29---------->
  Disk /dev/mapper/mpath29: 15 GiB, 16106127360 bytes, 31457280 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes

  root at zap06:/dev/mapper# kpartx -r /dev/mapper/mpath29--------------->
  root at zap06:/dev/mapper# ls -l mpath29--------------------------------->
  lrwxrwxrwx 1 root root 7 Feb 24 08:46 mpath29 -> ../dm-6
  root at zap06:/dev/mapper# 

  After Partition  creation:

  root at zap06:/dev/mapper# fdisk.distrib -l
  /dev/mapper/mpath29--------------->

  Disk /dev/mapper/mpath29: 15 GiB, 16106127360 bytes, 31457280 sectors
  Units: sectors of 1 * 512 = 512 bytes
  Sector size (logical/physical): 512 bytes / 512 bytes
  I/O size (minimum/optimal): 512 bytes / 512 bytes
  Disklabel type: dos
  Disk identifier: 0xce509b1c

  Device                Boot    Start      End  Sectors Size Id Type
  /dev/mapper/mpath29p1          2048     2048        0   0B 83 Linux
  /dev/mapper/mpath29p2          4096 10489855 10485760   5G 83 Linux
  /dev/mapper/mpath29p3      10489856 20975615 10485760   5G 83 Linux

  root at zap06:/dev/mapper# kpartx -r /dev/mapper/mpath29
  mpath29p2 : 0 10485760 /dev/mapper/mpath29 4096--------------
  mpath29p3 : 0 10485760 /dev/mapper/mpath29 10489856-------------------

  But instead of names like mpath29pX, the actual device nodes have
  names like mpath29-partX:

  root at zap06:/dev/mapper# ls -l /dev/mapper/mpath29*
  lrwxrwxrwx 1 root root       7 Feb 25 01:30 /dev/mapper/mpath29 -> ../dm-6
  brw-rw---- 1 root disk 252, 68 Feb 25 01:30 /dev/mapper/mpath29-part2
  brw-rw---- 1 root disk 252, 69 Feb 25 01:30 /dev/mapper/mpath29-part3
  root at zap06:/dev/mapper# 

  After that I created the filesystem on these partitions using the
  convention "mpath-part2".Its created successfully and I am able to
  mount it

  root at zap06:/dev/mapper# mount | grep "29"
  /dev/mapper/mpath29-part2 on /Fs29 type ext4 (rw)
  /dev/mapper/mpath29-part3 on /FS29_1 type xfs (rw)
  root at zap06:/dev/mapper# 

  Thanks
  Lekshmi

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