Which one of the following best describes what will happen if Discovery is configured with 3 MID Servers in a Load Balance Cluster with Shazzam cluster support disabled?
A.
All three MID Servers will be used during the Port Scan phase and all three will be used during the classification phase.
B.
Only one MID Server will be used during the Identification phase and all three will be used during the exploration phase.
C.
Only one MID Server will be used during the Port Scan phase and all three will be used during the classification phase.
D.
All three MID Server will be used during the Identification phase and only one will be used during the exploration phase.
I am sorry, but the answer is C:
In a ServiceNow Discovery setup with multiple MID Servers in a load balance cluster and Shazzam cluster support disabled, the following behavior is observed:
- Port Scan Phase: Only one MID Server will be selected to perform the initial port scan of the target system. This is to avoid overwhelming the target system with multiple simultaneous scans.
- Classification Phase: Once the port scan is complete, all three MID Servers can be utilized to classify the discovered services and devices. This is because the classification phase typically involves less intensive tasks and can be distributed across multiple MID Servers.
For a load balancing cluster, all mid servers are used. So the correct answer is A.
https://docs.servicenow.com/bundle/washingtondc-servicenow-platform/page/product/mid-server/task/t_ConfigureAMIDServerCluster.html
A seems correct.
Select the check box to distribute Shazzam processing among multiple MID Servers in a cluster and improve performance. This setting works with the Shazzam batch size. For example, a schedule is created to scan 100,000 IP addresses, with 10 MID Servers assigned to do the work. Each MID Server is assigned to scan 10,000 IP addresses. If the Shazzam batch size is set to 5,000 IP addresses per probe, the schedule runs two Shazzam probes per MID Server (10,000 IP addresses/5,000 per batch). These probes are run in sequence and not concurrently.
C is most correct.
Shazzam Cluster Support: Improves performance if more than one MID Server is available. Divides the IP loads among the different MID servers.
https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB0965884
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