[ClusterLabs] Antw: Re: Antw: Re: Can't do anything right; how do I start over?

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Tue Oct 18 02:18:26 EDT 2016

>>> Dmitri Maziuk <dmitri.maziuk at gmail.com> schrieb am 17.10.2016 um 16:51 in
Nachricht <0d370bc7-c74e-4250-5848-b9c7de9417cc at gmail.com>:
> On 2016-10-17 02:12, Ulrich Windl wrote:
>> Have you tried a proper variant of "lsof" before? So maybe you know
> which process might block the device. I also think if you have LVM on
> top of DRBD, you must deactivate the VG before trying to unmount.
> No LVM here: AFAIMC these days it's another solution in search of a problem.
> Next time I'll try to remember to do it from console root login in the 
> node, maybe I'll see whet lsof has to say then.
> I have a feeling it's not happening on plain kernel upgrade, only when 
> kmod-drbd is updated, but I don't have enough data points yet for 
> anything more than a feeling. I have a couple of haresources drbd+nfs 

Ah, that rings a bell: Sometimes when kernel modules are updated, some scripts think they must unload modues, then reload them. With a new kernel not being bootet yet, the modules on disk don't fit the running kernel. Maybe your problem is like this?

> clusters that don't do this, but neither of them is running dovecot... 
> could be systemd "RA" not stopping dovecot properly, too.
> Dima
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