Re: F38 proposal: Shorter Shutdown Timer (System-Wide Change proposal)

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On Wed, Dec 28, 2022 at 7:01 AM Ralf Corsépius <rc040203@xxxxxxxxxx> wrote:
>
> Am 28.12.22 um 11:49 schrieb Peter Boy:
> >
> > It is a good idea to make the timeout configurable.  But the default timeout for servers must remain unchanged.
>
> My problem is not "defined timeouts" it is systemd delaying shutdowns
> for no obvious reasons.

You've apparently not encountered the corruption of a database under
heavy load where the cache where swapspace has not yet been propagated
to disk. Imagine a server running a lot of virtual machines for an
image of what an overly aggressive shutdown timeout can do to your
otherwise stable systems.

> And as you asked: On my (bare metal) servers, Im am occasionally
> experiencing delayed shutdowns in the order of several minutes.
>
> This is simply inacceptable!
>
> Ralf

I'm assuming you have very busy filesystems, perhaps not well
configured for their load. There databases that can be *really*
corrupted by interrupted shutdowns, especially when the change has
been written to the disk cache but not yet committed to disk. And some
network services, like NFS, can take way too long to shut down
gracefully, but risk the upstream server if clients are forcefully
shut down.

Nico Kadel-Garcia
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