Art Alexion on 22 Sep 2010 08:55:39 -0700

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Re: [PLUG] Need Troubleshooting Advice: Disk Errors in Virtual Machines

  • From: Art Alexion <>
  • To: "Philadelphia Linux User's Group Discussion List" <>
  • Subject: Re: [PLUG] Need Troubleshooting Advice: Disk Errors in Virtual Machines
  • Date: Wed, 22 Sep 2010 11:54:15 -0400
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On Wed, Sep 22, 2010 at 5:54 AM, Casey Bralla <> wrote:
On Wednesday 22 September 2010 12:51:22 am Lee Marzke wrote:
> On 09/21/2010 08:00 PM, Casey Bralla wrote:
> > On Tuesday 21 September 2010 7:25:26 pm Lee Marzke wrote:
> >> On 09/21/2010 06:04 PM, Casey Bralla wrote:
You are probably correct.  However, upgrading is a very remote possibility.
These sites are donated to several family and friends.  I can't add RAM
without spending $ hundreds, which the family budget won't allow.

Still, even if I were completely overloading the server, I would expect to see
PERFORMANCE issues, not crashes.  In fact, performance seems pretty good.

In the world of VM, poor performance often presents itself in unexpected ways.

I may have to change the architecture as you suggested and combine several
sites on a single VM, but I was hoping to simplify (Ha!  That's working well,
isn't it?!? <grin>) my setup by giving each customer and web page/blog a
dedicated server.

We run into this problem at work a bit.  Some co-workers think they are *simplifying* things by virtualizing everything.  On smaller networks, they take a single "cheaper" server and create on it a separate VM for each server role.  Mostly, this is totally unnecessary.  What they don't think through is that instead of running those services on a single OS sharing resources, they are introducing a host layer, and multiple OS instances running concurrently on the same single piece of hardware.  Even before adding the roles to the VMs, you have a lot of overhead, so you really have to think about whether separate servers are necessary or even add anything positive.  VM technology is a great way to save money when you would definitely need separate boxes without it.  Too many people see it as a way to segregate things unnecessarily, just because they can.

I know *nothing* about apache, but if you don't need all of the VMs, ditch them.

I thought about switching to ESXi, but since BOTH VirtualBox & VMWare gave
very similar problems, there must be some other underlying cause.  Also, ESXi
seems like a $$ solution, which my CFO (Mrs Bralla) won't allow.

If I understand the curreent price structure ESXi is still free. You need a license, but you don't have to pay for it.  I defer to Lee for the definitive answer.

> I just gave a talk Monday at VMware user group on moving to ESXi [2],
> that you might find interesting.
> Lee
> [1]
> [2]
> n/presentation_view

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