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although it refers to docker, this link maybe of interest to you:<br>
<a class="moz-txt-link-freetext" href="http://developerblog.redhat.com/2014/09/30/overview-storage-scalability-docker/">http://developerblog.redhat.com/2014/09/30/overview-storage-scalability-docker/</a><br>
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<div class="moz-cite-prefix">Am 30.06.15 um 02:16 schrieb Federico
Alves:<br>
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<div class="gmail_default" style="font-size:small">I need to
create 500 identical containers, but after the first one, I
don´t want to repeat the same file 500 times. The disk is
formatted ext4. What should be the best type of format or
partition that would be 100% sparse, i.e., it would never
repeat the same information.<br>
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