A weekly maintenance process requires stopping ArcGIS Server and ArcSDE services. After restarting all the services, is it better to restart IIS Admin Service or recycle Default App Pool? I currently run a python script to do the later, with inconsistent results. Sometimes it takes 2 or 4 attempts, or stopping and starting AGS and ArcSDE services again, to get the web services working. I'd like a clear procedure that will work each time.
[GIS] Restart IIS Admin Service or Recycle Default App Pool
arcgis-serverenterprise-geodatabaseweb service
Related Solutions
I use the AGSSOM utility http://arcscripts.esri.com/details.asp?dbid=16293. It is a command linetool that works with Arc10 on both Win7 and WInServer2008. You can start, stop, and view running services from the command line. You can also write a batch script to schedule. Very nice little utlity.
Used the Capacity Planning Tool to help compare one super heavy map service vs 4 lite map services, and the results indicate that the heavy map service is the way to go.
This may not be the right answer, and the capacity planning tool does not take into account every factor (e.g. user workflows) - let me know via comments what you think.
1 super heavy map service:
App Server CPU utilisation = 49.4%
Database Server CPU utilisation = 7.6%
Network load = 16 Mbps
Display Response Time = 0.88 secs
(Images can be seen in large by RC and open in new tab)
4 lite map services:
App Server CPU utilisation = 55.4%
Database Server CPU utilisation = 7.6%
Network load = 64 Mbps
Display Response Time = 0.32 secs each, so between 0.32 and 1.28 secs depending on web browser overheads
More logic to support the one map service approach:
All layers are in the same map service, therefore;
a. one request is sent to the server
b. one SOC process draws the map
c. one image is returned over the networkThe 40 layers are spread across 4 map services (10 layers each), therefore;
a. 4 requests are sent to the server
b. 4 SOC processes draw a map
c. 4 images are returned over the network
1a and 1c will be faster and put less load on the network than 2a and 2c.
2b can use parallel processing to return a map quicker than 1b for a single user, but this will not be the case for many users. In fact, the overhead of the additional transactions being processed by the server in 2b (plus the additional network load of 2c) will see 1b scale much better as the number of users increases.
Best Answer
Restarting the IIS admin service just puts more steps into the restart process for IIS. It may make things easier for you, but I would recommend a more careful restart:
Restarting IIS Admin service would be fine, but if your server also has FTP or SMTP services running through IIS they will be brought down too. Recycling the Default App Pool (and any other pools that run your maps!) should be adequate.