[Xen-devel] LVM Snapshots: COW Internals

To:	Xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-devel] LVM Snapshots: COW Internals
From:	"Marconi Rivello" <marconirivello@xxxxxxxxx>
Date:	Fri, 26 May 2006 15:19:01 -0300
Delivery-date:	Fri, 26 May 2006 11:19:55 -0700
Domainkey-signature:	a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=WH4B2okE0hRR5rCku5oadZeVz6wwudHOAT+EZXT/KjefJQqcHyNeE2IQaprX2HXw677gk/HMO2Bf22n5WPTBj8bWRKA14ec/KSFSUGB0i3E3i07YsgY14byfUE7dDSyyTu5QJQxv9P7bYtx1frw77ldkt8Qn0xHb5BRqRV0LhQE=
Envelope-to:	www-data@xxxxxxxxxxxxxxxxxx
In-reply-to:	<bd15b9d50605260927o5ad8186bp3d9afa6f1a01cc8d@xxxxxxxxxxxxxx>
List-help:	<mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id:	Xen developer discussion <xen-devel.lists.xensource.com>
List-post:	<mailto:xen-devel@lists.xensource.com>
List-subscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe:	<http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References:	<bd15b9d50605260927o5ad8186bp3d9afa6f1a01cc8d@xxxxxxxxxxxxxx>
Sender:	xen-devel-bounces@xxxxxxxxxxxxxxxxxxx

Hello,

Could anybody point me where to find the internal structures of the COW devices in /dev/mapper?

What I want to do, exactly, is: make a backup of the snapshot in an image file, reading all the used blocks, and leaving the "not-used" ones. Later, I want to get the image file, and restore the cow device. But I can't find an LVM document describing exactly how the COW structure is stored in disk.

Thanks,

Marconi Rivello.

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

WARNING - OLD ARCHIVES

xen-devel

[Xen-devel] LVM Snapshots: COW Internals