[Bug 1473903] Re: parted will generate two devices when adding one partition on mpath device

[Mauricio Faria de Oliveira]

This is working correctly.
Marking as verification-done.

After partitioning with parted, there's only one device node for the
partition (with the -part disk-partition separator).

There's /still/ some messages in parted mentioning it could not find the
device, but the partitions are created correctly --  note  those
messages were already present in the original bug report, so this is not
a regression.

# multipath -l mpath1
mpath1 (0QEMU    QEMU HARDDISK   trustytest) dm-0 QEMU    ,QEMU HARDDISK   
size=8.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=-1 status=active
| `- 0:0:3:0 sdf 8:80 active undef running
`-+- policy='round-robin 0' prio=-1 status=enabled
  `- 0:0:2:0 sde 8:64 active undef running

# ls -l /dev/mapper/mpath1*
brw-rw---- 1 root disk 252, 0 Feb  9 10:55 /dev/mapper/mpath1

# parted /dev/mapper/mpath1
GNU Parted 2.3
Using /dev/mapper/mpath1
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Error: /dev/mapper/mpath1: unrecognised disk label
(parted) mklabel msdos
(parted) p
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/mpath1: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start  End  Size  Type  File system  Flags

(parted) mkpart   
Partition type?  primary/extended? primary
File system type?  [ext2]?
Start? 0%
End? 10%
Device /dev/mapper/mpath1-part1 not found
device-mapper: table ioctl on  failed: No such device or address
Device /dev/mapper/mpath1-part1 not found
device-mapper: table ioctl on  failed: No such device or address
(parted) p
Model: Linux device-mapper (multipath) (dm)
Disk /dev/mapper/mpath1: 8590MB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number  Start   End    Size   Type     File system  Flags
 1      1049kB  859MB  858MB  primary

(parted) q
Information: You may need to update /etc/fstab.

# ls -l /dev/mapper/mpath1*
brw-rw---- 1 root disk 252, 0 Feb  9 11:00 /dev/mapper/mpath1
lrwxrwxrwx 1 root root      7 Feb  9 11:00 /dev/mapper/mpath1-part1 -> ../dm-5

After some more play, all correct: only 1 node per partition (-part).

# ls -l /dev/mapper/mpath1*
brw-rw---- 1 root disk 252, 0 Feb  9 11:05 /dev/mapper/mpath1
lrwxrwxrwx 1 root root      7 Feb  9 11:00 /dev/mapper/mpath1-part1 -> ../dm-5
lrwxrwxrwx 1 root root      7 Feb  9 11:04 /dev/mapper/mpath1-part2 -> ../dm-6
lrwxrwxrwx 1 root root      7 Feb  9 11:05 /dev/mapper/mpath1-part3 -> ../dm-7
lrwxrwxrwx 1 root root      7 Feb  9 11:05 /dev/mapper/mpath1-part5 -> ../dm-8



** Tags removed: verification-needed
** Tags added: verification-done

-- 
You received this bug notification because you are a member of Ubuntu
Server Team, which is subscribed to multipath-tools in Ubuntu.
https://bugs.launchpad.net/bugs/1473903

Title:
  parted will generate two devices when adding one partition on mpath
  device

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/multipath-tools/+bug/1473903/+subscriptions