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Re: Pointers on LVM and Partitioning.

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David Brown wrote:
>
> With Xen, you have a minimal OS on the bottom, rather than having quite 
> a substantial Linux host as needed for VBox.  I think Xen also makes it 
> easier to attach PCI cards and other hardware to particular virtual 
> machines (though VBox has experimental support for that sort of thing). 
>   KVM is built into the kernel, and thus is probably slightly more 
> efficient.  It also has support for merging duplicate pages, which can 
> be a benefit when you have lots of virtual machines.

Xen comes with an assortment of complexities because it is intended as
the supervisor host for virtual images.  If you don't intend to run
virtual images I suggest not using the Xen kernel.

One client recently took a host to 64 GB memory.  Common enough for a
database production server.  It only acknowledged 32 GB when it booted. 
They called me to ask why.  I started digging.  "Hey look, you're
running a Xen kernel, any idea why?"  "No that's just how the previous
folks built it."  "We'll need to schedule another outage to switch to a
vanilla kernel.  When would you like."  "Saturday in three weeks might
be good.  We'll get back to you to schedule it."

The previous consultant had proposed using that box to host a web server
farm each image serving out interfaces for a different application.  Nce
idea but they eventually bought some physical boxes and built some
images under VMware to do that and forgot the build details of that host.

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Thread

Pointers on  LVM and Partitioning. Harry <simonsharry@gmail.com> - 2012-04-17 00:01 -0700
  Re: Pointers on  LVM and Partitioning. David Brown <david@westcontrol.removethisbit.com> - 2012-04-17 09:23 +0200
    Re: Pointers on  LVM and Partitioning. Harry <simonsharry@gmail.com> - 2012-04-17 07:38 -0700
      Re: Pointers on  LVM and Partitioning. David Brown <david.brown@removethis.hesbynett.no> - 2012-04-17 22:36 +0200
        Re: Pointers on  LVM and Partitioning. Harry <simonsharry@gmail.com> - 2012-04-19 07:14 -0700
        Re: Pointers on  LVM and Partitioning. Doug Freyburger <dfreybur@yahoo.com> - 2012-04-19 16:51 +0000
  Re: Pointers on  LVM and Partitioning. Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-17 12:50 +0100
  Re: Pointers on  LVM and Partitioning. Doug Freyburger <dfreybur@yahoo.com> - 2012-04-17 17:15 +0000
  Re: Pointers on  LVM and Partitioning. GangGreene <GangGreene@invalid.com> - 2012-04-17 18:05 -0400

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