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When running the ArcGIS Server postinstallation on a system where ArcGIS Server has been previously installed, the ArcGIS Server Post Install hangs if the server has map or globe services with large associated caches located in the default location.
Caches are built for Map and Globe services in ArcGIS Server to increase performance by serving pre-created tiles directly from a Web server. These caches consist of files inside a cache directory, by default C:\arcgisserver\arcgiscache. Caches may contain very large numbers of cache files. If the ArcGIS Server postinstallion is run after creating a cache in the default location, then the permissions for every file under C:\arcgisserver are updated. This can take a long time and the ArcGIS Server postinstallion appears to hang during this time.
The following steps outline how to prevent the ArcGIS Server postinstallion from needing to change the file permissions of every file in default-located caches by using operating system tools.
This breaks any UNC shares previously configured; reestablish them in step 8, below.
It is very important to NOT delete the ArcGIS Server Directories parent directory, C:\arcgisserver, by default.
Even though the move process happens instantaneously, it may take some time for the permissions inherited by the moved files to propagate to all files in the caches. If the cache is inaccessible even after performing step 9, wait some additional time, then re-start the affected Map or Globe services.