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List: xen-users
Subject: [Xen-users] solved: very strange problem: memory memory?
From: lee <lee () yagibdah ! de>
Date: 2014-11-25 12:10:49
Message-ID: 87h9xna3au.fsf () yun ! yagibdah ! de
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lee <lee@yagibdah.de> writes:
> Hi,
>
> does xen, or do domUs, somehow remember how much memory they had
> assigned to them?
>
> I've upgraded the memory of the server from 8GB to 36GB (8x4 + 4*1 GB),
> following the instructions in the manual about how to populate the
> banks. So far, the server is running fine.
>
> I have a VM which used to have 'memory = 3107' in its configuration.
> When I change the number to 10240 or 8192 or 4096 or even 3110, the VM
> crashes early during the boot process. Change it back to 3107 and the
> VM runs fine.
>
> There are other domUs that crash when they are booting when I change the
> amount of memory assigned to them, like from 384MB to 512MB. Change it
> back to 384MB and the VM runs fine. Only for two or three VMs, I was
> able to increase the memory.
>
> Dom0 and all domUs are running Debian Wheezy.
>
>
> Any idea what's going on here? Am I doing something wrong?
>
> The only thing that comes to mind is that for some reason, there's a
> strange problem with RAM modules of different sizes. But if that's the
> case, why is the server (IBM x3650 l2g) running fine?
I think I found out what it was: Instead of chaning the memory setting,
I changed the maxmemory setting and thus had the memory setting
commented out. So I guess the VMs crashed during boot because they ran
out of memory.
Perhaps there should be a warning printed when creating a VM with
unspecified memory settings, or with insufficient/very little memory ...
--
Again we must be afraid of speaking of daemons for fear that daemons
might swallow us. Finally, this fear has become reasonable.
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