This post is about a system diagram that explains a sample deployment using ArcGIS Server, ArcSDE and Image Server at 9.2. The concepts at 9.3 are similar but there's more integration enhancements.
Legend:- SOC - Server Object Container, ArcGISSOC.exe process
- SOM - Server Object Manager, ArcGISSOM.exe process
- MXD - Map Document authored with ArcMap
- Image Server - a windows service to manage Image Service Providers, service name: 'ESRI Image Server'
- ISP - Image Service Provider, workhorse of the Image Server, comparable to the SOC. Runs as a separate process (windows service with a name similar to 'ESRI Image ServiceProvider: 3383'). Each ISP runs on a different TCP/IP port.
- ISCDef - Image Service Compiled definition, a binary file which is the compiled image service definition components
- ISDef - Image Service definition, an xml configuration file (comparable to MXD for vector data)
- ArcSDE - A layer on top of a Relational Database System to add spatial capabilities to it
- GeoDB - Geodatabase. Can be an ArcSDE geodb, file based geodb etc
- ArcGIS Server Cache - image files of the cached Map Service corresponding to Map Document (MXD)
- Raster Data - any type of imagery file/data
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