Low isolation and maximum number of instances

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01-09-2019 02:31 AM
KubaSzostak1
New Contributor III

I have read Tune and configure services—Documentation | ArcGIS Enterprise but still I need some clarification. What happens with pooling when I set in Processes section low isolation? 

 

Processes section

Instances per process (low isolation only): 8

 

 

Pooling section

 

Maximum number of instances per machine: 4

Does it means there will be only one ArcSOC.exe process for this service? As I guess there will be 4 instances in one ArcSOC.exe process .

 

Maximum number of instances per machine: 12

Does it means there will be 2 ArcSOC.exe processes for this service? As I guess there will be 8 instances in one ArcSOC.exe process and 4 instances in second ArcSOC.exe process.

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Accepted Solutions
JonathanQuinn
Esri Frequent Contributor

The quickest answer is don't use low isolation. It's unstable and will be removed from the software eventually.

A more complete answer is described in earlier versions of the help. The Isolation section has been removed because we discourage its use:

Tuning and configuring services—Documentation | ArcGIS Enterprise

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10 Replies
JonathanQuinn
Esri Frequent Contributor

The quickest answer is don't use low isolation. It's unstable and will be removed from the software eventually.

A more complete answer is described in earlier versions of the help. The Isolation section has been removed because we discourage its use:

Tuning and configuring services—Documentation | ArcGIS Enterprise

RandallWilliams
Esri Regular Contributor

Piggy backing on Jonathan Quinn‌, people used to use low process isolation to try to 'do more with less', basically, to squeeze more running instances out of processes running on the GIS Server. These days, the better solution is to add more memory to the ArcGIS Server host and keep processes in high isolation. 

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FinnianO_Connor
Occasional Contributor II

Randall WilliamsJonathan Quinn‌ In a federated ArcGIS Server I do not see the option to change/set the isolation level. Is this expected behaviour? And if so, can I assume that all processes are running in high isolation?

Federated ArcGIS Server - no isolation settings

Thanks,

Finnian

RandallWilliams
Esri Regular Contributor

You're not crazy - this option to set processes to low isolation is just so *NOT* recommended that we removed it at ArcGIS Enterprise 10.5. It's not in the doc that Jakub referenced above, but you'd see it in the 10.4 doc. 

Tuning and configuring services—Documentation | ArcGIS Enterprise 

FinnianO_Connor
Occasional Contributor II

Good to know, thanks. Sometimes less options are easier to deal with!

JamalNUMAN
Esteemed Contributor

The “low isolation” option is still available in 10.7.1

 

The question is still valid: what does the instance per process mean?

We do understand that the number of instances per machine refers to the number of ArcSoc.exe that will be responding to the request on particular service, but how can we understand the instance per process?


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Jamal Numan
Geomolg Geoportal for Spatial Information
Ramallah, West Bank, Palestine
MoginrajMohandas
New Contributor III

"instances per process" means that you can assign multiple instances of a service to run under the same ArcSOC process. This is prone to stability issues, and we have actively discouraged it for some time now(hence the option disappearing from ArcGIS Server Manager), and will eventually be removed from the software. I would recommend trying out Shared Instances which is the new way to configure instances for your Map services. Introducing shared instances in ArcGIS Server 10.7  

JamalNUMAN
Esteemed Contributor

Hi Moginraj,

 

But what is the meaning of “multiple instances of a service”? I couldn’t feel the function of the instance!

 

If the process is the ArcSoc.exe, then what is the instance?

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Jamal Numan
Geomolg Geoportal for Spatial Information
Ramallah, West Bank, Palestine
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KubaSzostak1
New Contributor III

The quickest answer is don't use low isolation. It's unstable and will be removed from the software eventually.

This is not an answer to my question but this is the answer I was looking for  

Thanks!