If this feature works, I suppose we can have "incremental backup RBD(2 
copies,SSD based) to Rados ( 3 Copies,HDD based) " to achieve higher HA with 
quite a few extra cost :)

-----Original Message-----
From: [email protected] 
[mailto:[email protected]] On Behalf Of Sage Weil
Sent: 2013年3月26日 7:39
To: [email protected]
Subject: prototype incremental rbd backup

The wip-rbd-diff branch has an early prototype of rbd incremental 
backup/restore.  Currently it works like:

 rbd export-diff myimage@to --from-snap from - | \  rbd import-diff - 
myimagecopy 

The import apply the update stream and then create the final 'to' snap (which 
is referenced in the stream itself).  A filename can be used in place of -, 
naturally.

It's still very rough around the edges, but it's passing my basic tests; 
feedback is welcome!

sage
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