need to add
--failover-only end of line ?
It can go anywhere after the pool entries. In fact you don't "have" to add it, but many do. You could have it in the middle though, doesn't matter:
This is my config for 7950's
failover is in the middle
If you list multiple pools, it will switch to them either way. For a better description; Might as well hear it "from the horses mouth" so to speak. The Dev for CGminer
The normal failover mechanism in cgminer will allow some work to go to the backup pools if there is a delay in getting work from the primary pool you have set. This can be as much as 10% if the pool has latency issues. It then only fails to the backup pool if the primary pool stops giving work for 1 minute. failover-only does not change the failover mechanism, but it does not allow work to go to the backup pools unless the primary pool has failed completely for at least a minute. It then will switch to the backup pool. If cgminer considers a pool dead or down, it tries to contact that pool 1 minutely.
hope this helps