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Hi,

I've been trying to port filter scheduler (as well as host_manager(),
host_state(), filters, cost functions stuff) from Nova to Cinder.
While we are trying to get the change to land in G1, Russell raised
point that since majority of the code is shared between Nova and
Cinder, then we should get filter scheduler into Olso. IMO, this is
doable but it may take more effort to refactor the scheduler to adopt
the need of two projects than simply porting.  From Cinder's
perspective, it really needs this feature to allow real/sophisticated
placement decision to be made in order to support board choice of
storage back-ends, due to the fact that chance/simple scheduler are
just toys.

If this is the right thing to do, let's discuss how should we do it
and make sure we can land it before G2 since we were targeting this
feature to G1 for Cinder.  Any thought/comment/suggestion?  Thanks.


-- 
Regards
Huang Zhiteng