We have some servers with 6-8 instances. These are typically staging instances and 
maybe 1 low transaction production instance. 

We keep multiple instances on one server strictly for cost. Licensing additional 
servers would be prohibitively expensive so we bought higher end servers and stacked 
them with multiple instances. 

My concern here is with latch contention. I have read that its often best to have 
db_block_lru_latches set to 2 *CPU. We have 4 CPUs on each server and are an NAS hard 
disk array from network appliances. 

Do I have to take into consideration the additional instances on the server when 
considering latch contention? 

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