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xen-devel
RE: [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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