Hi,
this bug report is marked invalid in Ubuntu, and severity-high has no affect.

Please report this issue upstream at https://github.com/systemd/systemd
as it affects all Linux on z distributions (or will when they upgrade to
the relevant systemd version)..

Do you have a url to a github issue you have opened?

Regards,

Dimitri.

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https://bugs.launchpad.net/bugs/1623003

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

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

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 
   
  ---Debugger---
  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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