Example Tier Breakdown

	NRS Function
Tier 1	The Tier 1 instance of NRS is responsible for distributing queries to the indexes residing on Tier 2 and aggregating the results. The Tier 1 server also handles all web page requests, user accounts, alerts, and crawling/indexing/merging of user listings. RECOMMENDED HARDWARE: 4GB RAM, 1TB HD, 128GB SSD
Tier 2	Tier 2 servers typically hold 10 indexes, one on each solid state drive (SSD). Tier 2 servers only respond to search requests from Tier 1. RECOMMENDED HARDWARE: 4GB RAM, 10x 128GB SSD
Tier 3	Tier 3 servers typically hold 20 indexes. Indexes are spidered in turn. Every couple of weeks indexes are reindexed and pushed to Tier 2. RECOMMENDED HARDWARE: 8GB RAM, 4 x 1TB HD

More tech info...

· Application Architecture Diagram
· NRS technology

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