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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Tags added: kernel-hyper-v

** Changed in: linux (Ubuntu)
       Status: Confirmed => Triaged

** Tags added: kernel-da-key

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https://bugs.launchpad.net/bugs/1511534

Title:
  [Hyper-V] Fibre Channel multipath error message

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Problem statement:
  Wily (and probably other previous releases with the updated kernels) return a multipath error for vFC (virtual Fibre Channel).

  Symptoms:
  The following messages are in the dmesg log during booting:
      device-mapper: table: 252:4: multipath: error getting device
      device-mapper: IOCtl: error adding target to table

  After logging in, run the command: multipath -ll

  The multipath command does not return any errors, and no new messages
  are added to the dmesg log or syslog after running the multipath
  command.

  
  Steps to repro
  ============
  Tested with the released Wily (15.10), kernel 4.2.0-16-generic.

   1. Create a Wily VM.
   2. Boot and install the multipath-tools package.
   3. Shutdown and attach a Virtual Fiber Channel adapter and connect it to a virtual SAN.
      Note: The host must have a Fiber Channel adapter. Use Hyper-V managers Virtual SAN Manager to create a Virtual Fiber Channel Storage Area Network.
   4. Boot the VM.
   5. Issue the following command to see any errors were reported during the boot.
          dmesg | grep -i error
      You should see the following two error:
          device-mapper: table: 252:4: multipath: error getting device
          device-mapper: IOCtl: error adding target to table

  Otherwise, the vFC disks are usable and show no issues at a use test
  case.

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