** Tags added: bugnameltc-146190 severity-high

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  udev-generated /dev/disk/by-path names broken for virtio disks

Status in systemd:
Status in Ubuntu on IBM z Systems:
Status in systemd package in Ubuntu:

Bug description:
  The udev-generated /dev/disk/by-path names for virtio disks are broken on z 
Systems as they have the format virtio-pci-h.h.hhhh[-partn], where h.h.hhhh is 
the CCW devno of the virtio device representing the whole disk. Historically, 
the standard CCW naming was applied, which was ccw-h.h.hhhh[-partn]
  ---uname output---
  Linux ubuntu 4.4.0-36-generic #55-Ubuntu SMP Thu Aug 11 18:05:09 UTC 2016 
s390x s390x s390x GNU/Linux
  Machine Type = 2964-703 running KVM for IBM z Systems 
  A debugger is not configured
  ---Steps to Reproduce---
  1. Install Ubuntu LTS 16.04.1 on KVM for IBM z Systems 1.1.1
  2. Issue ls -l /dev/disk/by-path
  Userspace tool common name: udev 
  The userspace tool has the following bit modes: 64-bit 

  Userspace rpm: udev

  Userspace tool obtained from project website:  na

  There are basically two problems with this:
  1. The naming is technically incorrect, since the virtio devices on z are no 
PCI devices but CCW devices
  2. Then naming based on virtio- is backwards incompatible. This may seem not 
to be an issue for Xenial but customers may be confused if they have been 
running Linux on KVM for IBM z before.

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