Re: [linux-lvm] [lvmlockd] recovery lvmlockd after kill_vg

[Damon Wang <damon.devops@gmail.com>]

It's really help, I noticed "sanlock client renewal" returns practical
information, but not noticed "sanlock client status -D", the later is
what I exactly want, thanks!

Damon

On Fri, Sep 28, 2018 at 10:32 PM David Teigland <teigland@redhat.com> wrote:
>
> On Fri, Sep 28, 2018 at 11:14:35AM +0800, Damon Wang wrote:
>
> > as the manual says, it should deactivate volumes and drop lockspace as
> > quick as possible,
>
> A year ago we discussed a more automated solution for forcing a VG offline
> when its sanlock lockspace was shut down:
>
> https://www.redhat.com/archives/lvm-devel/2017-September/msg00011.html
>
> The idea was to forcibly shut down LVs (using dmsetup wipe_table) in the
> VG when the kill_vg happened, then to automatically do the 'lvmlockctl
> --drop' when the LVs were safely shut down.  There were some loose ends
> around integrating this solution that I never sorted out, so it's remained
> on my todo list.
>
> > TTY can get a message, but it's not a good way to listen or monitor, so I
> > run vgck periodically and parse its stdout and stderr, once "sanlock lease
> > storage failure" or
> > something unusual happens, an alert will be triggered and I'll do some
> > check(I hope all this process can be automatically).
>
> If you are specifically interested in detecting this lease timeout
> condition, there are some sanlock commands that can give you this info.
> You can also detect ahead of time that a VG's lockspace is getting close
> the threshold.  I can get back to you with more specific fields to look
> at, but for now take a look at 'sanlock client renewal' and some of the
> internal details that are printed by 'sanlock client status -D'.
>
> Dave