Hi Sage and all :
I am tring to understand cursh more deeply. I have tried to read
the code and paper, and search the mail list archives , but I still
have some questions and can't understand it well.
If I have 100 osds, and when I add a osd , the osdmap changes,
and how the pg is recaulated to make sure the data movement is
minimal. I tried to use crushtool --show-mappings --num-rep 3 --test
-i map , through changing the map for 100osds and 101 osds , to look
the result , it looks like the pgmap changed a lot . Shouldn't the
remap only happen to some of the pgs ? Or crush from adding a pg is
different from a new osdmap ? I konw I must understand something
wrong. I appreciate if you can explain more about the logic of adding
a osd . Or is there more doc that I can read ? Thank you very much
!!! : )
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