Hi list,
I have a problem understanding on how crush works when the crush map
changes.
Let's take a pool with some data in it, and a crush map that enables a
client to calculate itself where a particular chunk is stored.
Now we add more OSDs, which means, the crush map changes. Now most
objects are misplaced, given the new crush map.
If the clients wants a particular chunk, it takes the modified map, but
as the chunk is misplaced, it won't find it where the crush algorithm
points to.
How can the client know which crush map to consider when doing the
calculation?
Do the clients keep several versions of the map, and try them one after
the other?
Thanks for some hints on this.
--
Andre Tann
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