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


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