Doug Stewart on 22 Sep 2010 09:35:15 -0700

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Re: [PLUG] Virtual Side Topic

  • From: Doug Stewart <>
  • To: Philadelphia Linux User's Group Discussion List <>
  • Subject: Re: [PLUG] Virtual Side Topic
  • Date: Wed, 22 Sep 2010 12:35:31 -0400
  • Cc: "" <>
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As long as they do not start gimping functionality for non-SuSE Linuxes, I'm fine with it. 

Doug Stewart

On Sep 22, 2010, at 12:25 PM, "Brian Vagnoni" <> wrote:

> What do people think about the possibility of VMWare purchasing SUSE from Novell?
> Sent from my Android phone using TouchDown (
> -----Original Message-----
> From: Richard Freeman []
> Received: 9/22/10 10:51 AM
> To: []
> Subject: Re: [PLUG] Need Troubleshooting Advice: Disk Errors in Virtual.Machines
> On 09/21/2010 06:04 PM, Casey Bralla wrote:
>> Anybody have any thoughts on what might cause these disk errors, or what I 
>> might check?
> Well, I guess we can start by just listing the various possibilities:
> 1.  Kernel issue in the guest that causes the panic - perhaps no real
> fault in any lower layer.
> 2.  Error in the VM code, that causes an apparent disk error to the guest.
> 3.  Error in the host software (kernel, other processes, etc) that
> interacts with the VM to manifest itself in a disk error in the guest.
> 4.  Error in the host hardware that causes a disk error in the guest.
> Note that host hardware errors could be ANYTHING, since the disk is
> virtual.  A disk error in the guest might have nothing to do with a
> physical disk error, unless maybe the guest is directly mapped to a
> physical disk.
> RAM errors of course jump to mind as a possibility, perhaps only under
> load or long uptime (temperature/etc).  Power supply problems could also
> cause any number of glitches.  The problem could be almost anything.
> If the host isn't generating any kind of error I tend to doubt that the
> issue is host software, but you can't rule that out.  Switching to a
> different platform (xen/etc) would probably address any issue in #2-3
> above, and perhaps even mitigate #4 (RAM/resource use patterns will be
> different).
> These kinds of gremlins can be really hard to track down.  I was having
> intermitent problems on my server at home, and thought they were fixed.
> They started coming back right around summer, which made me think heat.
> This is an older server, and I opened it up and really cleaned out the
> more sensitive components with compressed air (heat sinks/etc), turned
> on cpu scaling (to reduce heat generation), and haven't had problems
> since even with chromium builds.
> As far as load/etc goes - that clearly can make bugs in the VM or other
> components more apparent.  However, well-written software should not
> crash at any level of load - the VM should just be slow.  If the OS
> panics when you hit a load of 75, then there is a bug in the OS or at a
> lower layer.  Of course, if you can avoid these kinds of bugs, so much
> the better.
> Good luck with it!
> Rich
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