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[Xen-users] snapshots with vhd-util/blktap2

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Carsten from Virtastic <carsten@xxxxxxxxxxxxx>
  • Date: Wed, 27 Jul 2011 17:51:56 +0100
  • Delivery-date: Wed, 27 Jul 2011 09:53:12 -0700
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  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Hi guys,

According to vhd-util's help, you can create snapshots from VHD files:

# vhd-util snapshot
options: <-n name> <-p parent name> [-l snapshot depth limit] [-m 
parent_is_raw] [-h help]

But the question is, how do I use them to revert? 

# vhd-util revert
options: <-n name> <-j journal> [-h help]

Where does the journal come from? I've noticed that the snapshots themselves 
never grow (they remain just a few kb in size).

I can use the scan and check operations and all that, and it's referring to the 
parent correctly. So the only bit which I seem to be missing is the journal.

The README, which is linked to from the Xen wiki [1] is not too helpful either, 
because it basically only covers creating and using VHD, but everything else 
seems to be left as an exercise to the reader. Manpages don't seem to exist. 
Anyone here able to shed some light on that subject please? :-)



[1] http://lxr.xensource.com/lxr/source/tools/blktap2/README

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