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RE: [Xen-devel] Re: [PATCH 0 of 6] dm-userspace xen integrationpatches

  • To: "Dan Smith" <danms@xxxxxxxxxx>, "Julian Chesterfield" <jac90@xxxxxxxxx>
  • From: "Ian Pratt" <m+Ian.Pratt@xxxxxxxxxxxx>
  • Date: Tue, 29 Aug 2006 15:42:46 +0100
  • Cc: Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Tue, 29 Aug 2006 07:43:10 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcbLcSsecgzR05x/SpKNsKCmXwcPUAAB91GQ
  • Thread-topic: [Xen-devel] Re: [PATCH 0 of 6] dm-userspace xen integrationpatches
> Right, but we are interested in CoW between two block 
> devices.  That's why we have created a special CoW format 
> (qcow wastes a lot of space to do sparse allocation, which is 
> pointless and slow on a block device).  We looking to support 
> things like using two iSCSI block devices to do CoW 

What data structure / format are you using for storing the CoW data?

Ian 

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