Hi nova devs,

Have been having a good look into cellsv2 and how we migrate to them (we’re 
still on cellsv1 and about to upgrade to queens and still run cells v1 for now).

One of the problems I have is that now all our nova cell database servers need 
to respond to API requests.
With cellsv1 our architecture was to have a big powerful DB cluster (3 physical 
servers) at the API level to handle the API cell and then a smallish non HA DB 
server (usually just a VM) for each of the compute cells. 

This architecture won’t work with cells V2 and we’ll now need to have a lot of 
highly available and responsive DB servers for all the cells. 

It will also mean that our nova-apis which reside in Melbourne, Australia will 
now need to talk to database servers in Auckland, New Zealand.

The biggest issue we have is when a cell is down. We sometimes have cells go 
down for an hour or so planned or unplanned and with cellsv1 this does not 
affect other cells. 
Looks like some good work going on here 

But what about quota? If a cell goes down then it would seem that a user all of 
a sudden would regain some quota from the instances that are in the down cell?
Just wondering if anyone has thought about this?


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