benefit of using stripingv2

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Hi guys,

afaik rbd always splits the image into chunks of size 2^order (2^22 = 4MB by default). What's the benefit of specifying
the feature flag "STRIPINGV2"? I couldn't find any documenation about it except
http://ceph.com/docs/master/man/8/rbd/#striping which doesn't explain the benefits (or I just don't get it). Better docs
in this area would be greatm, so I created an issue for that: http://tracker.ceph.com/issues/13123

I also noticed the rbd client (0.94.3) ignores the striping feature on image creation, I created issue
http://tracker.ceph.com/issues/13122 for that. It is really a bug or does it mean stripingv2 is going away and should
not be used?

Cheers
Corin
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