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[Xen-devel] LVM Snapshots: COW Internals


  • To: Xen-devel@xxxxxxxxxxxxxxxxxxx
  • From: "Marconi Rivello" <marconirivello@xxxxxxxxx>
  • Date: Fri, 26 May 2006 15:19:01 -0300
  • Delivery-date: Fri, 26 May 2006 11:19:55 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

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.
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