I am looking for a hardware sizing tool to determine adequate hardware for our application that will soon be expanding from 25,000 active users, to 85,000 active users. At any given time I suspect I will not have anymore than 500 users logged in at any one time, with 200 being a median . Is there some equation for calculating the number of users that an application serving tier can handle based on the processing power/number of CPU's and memory? We are currently using Sun Solaris 2.5.9, RDBMS 9.2.02, Oracle applications 11.5.7, HR only. I am maintaining 4 instances , (3 copies of PROD generate little DB activity) , on a Sun Sunfire 280R, dual processor, 8gb ram, and alot of SAN based storage for my DB tier. I have a middle tier for each Instance on another Sunfire 280R , 2 processors, 8gb ram, application server discoverer etc... For the pupose of covering the increased load, we are contemplating acquiring 2 Sun 880Rs , 2-4 processors, and some multiple of 8gb ram for memory, and clustering them for the DB tier requirements. For our middle tier, we are planning using our existing s280r's , and implementing load balancing... if that approach is still appropriate. We have 3 now. Any gotcha's with 9i RAC? Oracle Applications requirements for this environment? What would be a recommended migration path/approach? Thanks All!
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