How to treat Severe ArcGIS Server Logs for System/DynamicMappingHost.MapServer?

[Yogesh_Chavan]

We are facing the below severe error logs on ArcGIS Server.

Trying to understand what could be triggering this or is there some ways to minimize/fix these errors?

Any help on this would be highly appreciated.

[JakeSkinner · Accepted solution]

Hi @Yogesh_Chavan, are you services configured with Shared or Dedicated instances? 

I've seen this error before when all services are configured with Shared.  Try changing the services to Dedicated.

https://enterprise.arcgis.com/en/server/latest/administer/windows/configure-service-instance-setting...

[Yogesh_Chavan]

Thank you @JakeSkinner for your insights.

We have 94 services on the server and very few are using the dedicated pool and all the others are on shared pooling.

Do we have to change pooling for all the services?

[JakeSkinner]

I would highly recommend the more frequently used services be switched to dedicated.  I typically only recommend a few services be set to shared instance type.

[berniejconnors]

I agree with @JakeSkinner.  We configure our map services in a similar way.  We reserve the use of shared instances for services we are quite certain will be used infrequently.  About 20 map services (or 25%) use the shared pool.

Bernie.

[DavidColey]

I would agree with both @JakeSkinner and @berniejconnors  - our Federated site is a 2 machine cluster, 8 cores each.  So for the site, I have the dynamic mapping service pooling set to 8 number of instances, giving me 16. But you shouldn't set the number of instances it can use to more than the number of cores you have.

So as a rule of thumb for the dynamic service, I would publish no more than 30 simple map services services to the shared instance.  In practice, I have about the same as Bernie, 15 -20 or so simple map image services.

As for the warning about the dynamic service crashing, I do not see that very often and since there is not much I can do about it, I just ignore it.  The service recovers and I move on.

I use Monitor, and for my any of my shared or dedicated instances, I can see the % saturation.  If I were to see one of my shared instances using up to like 75%, I would consider moving that instance to dedicated.  Otherwise, that might be or maybe could be the cause of the dynamic map service instance crashing. . .