Google Search Appliance G500
The G500 is aimed at applications with larger data sets; a single G500 can be licensed for 25 million to 100 million documents. This makes it suitable for larger, typically centralized enterprise search applications, or for public facing websites holding a substantial amount of content. The G500 comes with built-in redundancy and failover.
G500 search appliances can be networked together seamlessly to provide a single point / single results set search over hundreds of millions or even billions of documents.
The G500 replaces a previous appliance, the GB-9009, and is aimed at applications that involve 25 million documents or more.
Search applications for smaller data sets can be more cost effectively addressed by the G100 Google Search Appliance.