Re: [vserver] vdu during start of guests

From: Andre Timmermann <>
Date: Tue 24 Jun 2008 - 08:09:36 BST
Message-Id: <>

Good morning.

Am Dienstag, den 24.06.2008, 02:42 +0200 schrieb Daniel Hokka Zakrisson:

> > after enabling disklimits, I noticed that starting a guest will
> > the usage of vdu - this will significantly slow down the start of
> > vservers and will even prevent the start, if the guest is over
> Only if you didn't stop the guest cleanly, or if you've just applied
> them. vserver ... stop caches the values for vserver ... start.

OK, I have seen these vdu-processes on machines, which crashed hard.
There was noway to shut down the guests cleanly.

> > I did not find a way to configure this behaviour. I would like to
> > the vdu, as this can be handled later (for example, when you try to
> > enforce such limits on existing customers :)
> Huh? And what would you initialize the values to?

I would prefer to apply them later on the running guest.

> It makes no sense to limit disk usage and say "I don't care about how
> it uses."

On on hand it is a way to limit the guests, on the other hand ist is a
very easy way to monitor the disk usage of the guest.

> > On some machines the vdu will take up to 90 minutes, which can be
> > anoying, if it fails.
> "Fails"? How would it "fail"?

OK, this was not very clear. Lets say, I have a machine with 16 guests.
The machine crashes at night and I have wake up and fix it. If I don't
have to care about vdu, the guest will start within 5 minutes and I can
see if one guest fails to start du to whatever (database, broken

If vdu will take two hours to test all guests and a guest fails to
start, I have to wait the whole time to see if all customers are up and

You don't want to share the office with me, when I'm tired ;)

In addition, the guest which will be startet at last will have a very
long downtime. This may be anoying for that customer, too ;)

> I don't understand what you're trying to accomplish. Either you want
> limit stuff, in which case you _need_ to know how much the current
> is, or you don't, in which case you don't configure it.

I get your point. It is true, but it seems that I can activate the
limits on a running guest. This will speed up things a lot if something
goes wrong. It is a big difference between a physical limit on a machine
and a handmade virtual limit. I don't have to care about physical
limits, nobody would dare to write files beyond.

Best regards,
Received on Tue Jun 24 08:09:55 2008

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