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I have several virtualized instances of XP and W7 on KVM, and each week I take an LVM snapshot of the qcow2 file and rsync it to a remote site. I'd like to reduce my bandwidth usage if possible - what can I change on those machines to minimise unnecessary changes in the qcow2 file?

Should I:

  1. reduce the cache size for the browser?
  2. turn off the pagefile?

or do you have any other suggestions?

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While I am uncertain of the format KVM uses for the virtual harddisk, any suggestions about the guest OS's behavior will assume an object inside the guest OS corresponds to a certain area on the virtual harddisk itself. I'm curious if this assumption proves true. –  surfasb Jan 14 '12 at 17:00
    
qcow2 is a copy-on-write filesystem. Writing to the pagefile for example will allocate new blocks, but release the old ones that can then be re-used. –  Jack Douglas Jan 16 '12 at 9:24

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