[Xen-users] COW (Copy-On-Write) storage options in Xen

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Subject:	[Xen-users] COW (Copy-On-Write) storage options in Xen
From:	"Mark Ryden" <markryde@xxxxxxxxx>
Date:	Sat, 3 Mar 2007 09:16:04 +0200
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Hello,

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 :
http://wiki.xensource.com/xenwiki/COWHowTo

And also some instructions from Michael Lang for using
unionfs for COW for Xen:
http://wiki.xensource.com/xenwiki/InstructionsFromMichaelLang

My question is :
There are some altenatives which are discussed in that wiki page:
unionfs, blktap ,using qemu: see
http://lxr.xensource.com/lxr/source/tools/blktap/,
BenRin's Copy-on-Write md device,Translucency , DmUserspace
,parallax, CowNFS , and LVM snapshots (According to MichaelVrable wiki
as I understood it).

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

Regards,
Mark Ryden

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