[clug] Seeking FOSS Hypervisor and Management GUI

Sam Couter sam at couter.id.au
Fri Oct 3 06:07:30 MDT 2014

I use LVM to flexibly split large disks into multiple partitions. I don't
use it to join disks, although it is capable. It multiplies your risk of
disk failure, however, as you can't count on anything working if a single
disk in an LVM partition fails.

I was running virtual servers to create a virtual DMZ to run email and web
services. Most recently was KVM, previously was UML and before that Xen.
Xen was pretty good isolation and performance-wise but not being part of
the mainline kernel means kernel updates randomly broke it. UML was fairly
short-lived. It's userspace and doesn't isolate guest processes all that
well although it is lightweight. Most happy with KVM, no complaints at all.

I have since decommissioned all my virtual servers and the DMZ so I
probably can't offer any more recent advice.

On Fri, Oct 3, 2014 at 8:03 AM, George at Clug <Clug at goproject.info> wrote:

>     Sam, thanks for your comments. If I suspect that I will need more
> disk space later, then I use LVM too, especially for VMs where
> everything is virtual anyway.
> One day I would like to learn what happens to a physical drive LVM
> configuration if one of the drives die. Do you loose the lot, or
> somehow only loose the data that is on the dead drive, but how does
> that affect the directory listings, files, etc.  How do you know what
> was lost and what was not?
> As I am currently still using/trailing KVM with Virt-Manager and
> command line snapshots (until CentOS or Debian have packages for
> Virt-Manager versions that support snapshots) for my virtualisation
> host, last night I investigated Windows 10 as a VM on KVM.  This
> worked surprisingly well. After installation (over the top of a
> previous Win8 Enterprise trial that I used to test Windows VM on KVM)
> I used RDP to access the image from a Windows 7 PC that has three
> monitors. Windows 10 (via RDP) instantly had three screens,
> performance was quite good. I could not watch full screen video from
> youtube on a 24" monitor but watching video in its original screen
> size worked very well, including sound.
> Soon I will get back to testing command line snapshots further.
> If you are using Virtualisation or containers, what Guest OS's or
> processes and purpose do you use virtualisation for.  File,
> Minecraft, Mail, video conferencing, and web server are the tasks that
> my servers perform.
> At Thursday, 02-10-2014 on 21:00 Sam Couter wrote:
> I use LVM when partitioning virtual or physical servers so I can grow
> them on demand. Or even shrink them on occasion.
> Partitioning is definitely a subject all of its own. You will find
> plenty of proponents of the "one big disk" approach you have taken.
> It's easily the simplest approach. If it works for you, stick with it.
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