ArcGIS 10 SFT III

[JavierClavijo]

It is possible to work with System Fault Tolerance (SFT) III  (or server mirroring - when the second server mirrors the first one and takes over in the case the first server crashes)? If it is possible can you please let me know where I can get information regarding this issue?

Thanks in advance

[GregoryPonto]

One method of implementing fault tolerance with ArcGIS Server is by implementing multiple GIS Tier components referred to as "SOM" systems within the ArcGIS Server Architecture each with its own unique web tier. This can be done by:

1.  Installing the complete ArcGIS Server solution on multiple machines which will yield multiple completely self contained GIS solutions, see:

ArcGIS Server One-Machine Deployment
http://help.arcgis.com/en/arcgisserver/10.0/help/arcgis_server_dotnet_help/index.html#/Configuring_a...

ArcGIS Server Multi-Machine Deployment
http://help.arcgis.com/en/arcgisserver/10.0/help/arcgis_server_dotnet_help/index.html#/Configuring_a...
*Note the above describes a high capacity solution that can be implemented in conjunction with a high availability solution (further below) to spread the load of many GIS Services across many servers.

2. Then publish identical map services to each GIS.

3. Then implement an HTTP load balancer "above" each GIS that references each unique GIS. 

The above strategy is very "high level" as and such I'd strongly recommend first reviewing the documentation and solutions contained below:

ArcGIS Enterprise GIS Resource Center
http://help.arcgis.com/en/arcgisserver/10.0/help/arcgis_server_dotnet_help/index.html#/Configuring_a...

Then, consider working with Esri Professional Services - Implementation Services to ensure successful implementation of your high availability GIS solution:
http://www.esri.com/services/professional-services/implementation/index.html