Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Confirmed
** Tags: hyper-v
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https://bugs.launchpad.net/bugs/1511534
Title:
[Hyper-V] Fibre Channel multipath error message
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