Le 25/09/2015 11:27, KatolaZ a écrit :
On Fri, Sep 25, 2015 at 11:06:50AM +0200, Didier Kryn wrote:
Le 24/09/2015 19:54, KatolaZ a écrit :
But let's be honest here: how many times does it happen that you have
to reboot a production server nowadays? It is quite rare that a
failing program actually needs a reboot, right? And even when it
happens, 1 minute or 5 minutes boot won't change your overall uptime
percentage that much. If you are at 99.999% with a 1 minute boot
(which corresponds to one reboot every 2 months and a half, already
ways too much for the vast majority of production servers) with an
exagerated 5 minutes boot you will move to 99.995%.
Dear Katolaz,
I'm sory but you only think "server". I think this
dpendency-base startup and supervision is primarily dedicated to
laptops, although there must be other cases needing ultra-fast
boots. Linux is not dedicated only to big server farms.
Dear Didier,
I actually had the impression that servers was what Laurent was
referring to... :)
Anyway, it doesn't matter. Your clarification confirms my doubts: this
quest for "speed" could make sense mainly for mobile devices (I
personally reboot my laptop every 3/4 months, on average, and only
because I forget to plug the AC adapter overnight, so I still can't
see the issue for laptops), and I could agree on that, but please do
not bring servers and high availability scenario to support "smart"
dependency-based boots, since, as strange as it might sound, high
availability has nothing to do with boot speed, at all.
As far as I understand s6 is for supervision only, while s6-rc
provides both fast startup and supervision. Supervision is a usefull
feature for servers, but I fully agree that startup speed is not.
But, as you or Jaromil said, and we all agree on this, the
important thing is that Devuan provide this new high quality software,
so that admins have more freedom. Important also is the fact that fast
and dependency-based startup and supervision is the major sales argument
for Systemd, and s6-rc does it better and in a simpler way, and does
only that.
BTW I don't trust enough suspend mode to use it all the time. On
some of the servers I am running, uptime often exceed a year, but I like
shuting down my laptop when I don't use it. Good to know that suspend
works so well for you :-)
Didier
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