Re: dm-multipath test scripts

[Mike Snitzer <snitzer@redhat.com>]

On Wed, Oct 07 2015 at  1:39am -0400,
Junichi Nomura <j-nomura@ce.jp.nec.com> wrote:

> This is a set of scripts for kernel-side dm-multipath testing. Current
> set of scripts are stress testing of extreme situation and its coverage
> is limited. But recently found dm-mpath regressions should be detectable
> with this. I hope this helps people working on dm-multipath related code
> as a regression test set.
> 
> Though this is created as a patch for linux kernel source, it's just for
> convenience of kernel developers (I don't have a place to host this kind
> of scripts). If there are better place to contribute this, please let me know.
> 
> Please check README for how-to-run and possible improvements you could
> contribute in future.

I finally got around to trying these scripts.  Thanks for making them
available.

But unfortunately I cannot get either the scsidebug or tcmloop mode to
run against v4.5-rc4

For tcmloop, targetcli fails with:
"Could not create ISCSIFabricModule in configFS."
(fixed by enabling CONFIG_ISCSI_TARGET under TARGET_CORE)

I'm seeing all tests fail due to fio verification failure.  I'll need to
inspect this further..

But the most problematic test is ./tests/test_03_dm_failpath -- it seems
to actively break _any_ v4.5-rc kernel I try (with a never-ending flood
of messages like "device-mapper: multipath: Failing path 8:192."); I
haven't tried older kernels.

What is the last kernel version that your scripts have worked on?

Taking a step back:
These scripts don't belong in Documentation/device-mapper/mptest/ (or
anywhere in the kernel tree for that matter).

I'd really prefer it if we could port your scripts over to the
device-mapper-test-suite, see:
https://github.com/jthornber/device-mapper-test-suite

Mike