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[Xen-devel] COW in Xen

  • To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Mark Ryden" <markryde@xxxxxxxxx>
  • Date: Mon, 5 Mar 2007 20:41:56 +0200
  • Delivery-date: Mon, 05 Mar 2007 10:41:06 -0800
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>


I had posted this question in Xen-user mailing list three days ago and I did not
get a single answer. On a second thought, maybe xen-devel is more
appropriate so
I am trying again in the hope that I will receive an answer:

Does anybody have an experience (good or bad) with using
COW (Copy-On-Write) storage in Xen ?

I saw that there is a (rather small) wiki page about it :

And also some instructions from Michael Lang for using
unionfs for COW for Xen:

My question is :
There are some altenatives which are discussed in that wiki page:
unionfs, blktap ,using qemu: see
BenRin's Copy-on-Write md device,Translucency , DmUserspace
,parallax, CowNFS , and LVM snapshots (According to MichaelVrable wiki
as I understood it).
And BTW- does the XenFS has (or is intended to have) COW support ?

What are the pros and cons of these options ? is there a  preferred
one when using Xen ?

Mark Ryden

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