guy@netapp.com (Guy Harris) writes:
No one had to sell their soul. We just re-wrote how snapshots are done in 6.x. This re-write changes how the blockmap file is generated and give lots of benfits.
...
You may have heard about the "Split Blockmap"? This is the re-write I describe above.
Well, the split blockmap changes did more than just rewrite the snapshot code - it was a change to the way WAFL keeps track of which blocks are in use in general, and which blocks are in use in particular snapshots, not just a rewrite of the way snapshots were done.
It would be nice to see a ( white paper | technical report ) on this reorganisation. I cannot find anything relevant in http://www.netapp.com/tech_library/ so far.
Chris Thompson University of Cambridge Computing Service, Email: cet1@ucs.cam.ac.uk New Museums Site, Cambridge CB2 3QG, Phone: +44 1223 334715 United Kingdom.