[Bug 1647067] Re: Dangling UDEV links after removing FC LUNs

[wondra]

** Package changed: linux (Ubuntu) => udev (Ubuntu)

** Changed in: udev (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1647067

Title:
  Dangling UDEV links after removing FC LUNs

Status in udev package in Ubuntu:
  New

Bug description:
  We're using Q-Logic QLE2562 Fibre Channel adapters (qla2xxx driver)
  against a HPE 3PAR 7400c storage array in an OpenStack environment.
  The OpenStack 3PAR driver manages volume attachments from the array to
  the servers. There is 4 path multipath to every volume.

  As the LUNs are removed, sometimes udev does not remove all links,
  particularly in /run/udev/links and /dev/disk/by-path. The symptoms
  are multiple records in one by-path directory under /run/udev/links,
  broken links to no longer attached luns in dev/disk/by-path and links
  between wrong LUNs and scsi devices there.

  OpenStack relies on these links. When another volume is attached using
  a LUN that has these leftover links and it happens that it is the
  first of the 4 paths, OpenStack incorrectly identifies the volume and
  attaches the same volume to multiple instances, leading to data loss.

  What could be causing this behavior?

  Ubuntu version 14.04 
  Linux version Ubuntu 4.4.0-47.68~14.04.1-generic 4.4.24
  udev 204-5ubuntu20.19

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