Discovery time

itstk
Tera Contributor

‎06-27-2017 10:31 AM

How much time take to discover 3500 servers in ServiceNow? Weare using just 1 midserver

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Will66
Tera Contributor

‎06-27-2017 12:34 PM

It all really depends on where those servers are located (IE, are they in a different office building, different city/state/country) and if you have the proper ports opened and everything configured correctly.   If everything is configured properly and those servers are in the same data center as your MID, then you can expect 1-3 hours to be a realistic time frame.


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Dave Smith1
ServiceNow Employee
ServiceNow Employee

‎06-27-2017 02:46 PM

Have you considered batching? It won't make it faster, but you'd get results more quickly and can also resume after a possible failure.



You may also want to consider having several MID servers and clustering them to share the load or improve processing ability.



As Will says, there are several factors that influence the time taken:


  • how many attributes you want to discover for each device
  • the type of device - routers may be discovered much more quickly than a complex MS-SQL Server
  • the amount of information returned by each device (sensor processing overhead)
  • the performance of the MID server (RAM caching payloads, JVM sizing, etc)


For a more accurate estimate, why not time a small group of devices then extrapolate that up?


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VivekSattanatha
Mega Sage
Mega Sage

‎06-28-2017 01:01 AM

HI Cristhian,



doug.schulze   mentioned in his documents about Discovery estimation. I will change the numbers according to your device count.



Suppose 7 probes needed to discover the device then discovering 3,500 devices would require about 7*3,500 = 24,500 probes. With 25 threads, the MID server can process about 25 probes per minute. Therefore we can estimate that this work will take 24,500/25 = 980 minutes or about 16.3 hours.



Note: the numbers are approximate, In real time it may change little.



Regards,


Vivek



Based on the impact hit like, helpful or correct


Dave Smith1
ServiceNow Employee
ServiceNow Employee
In response to VivekSattanatha

‎06-28-2017 05:06 AM 

Vivek Sattanatha wrote:


doug.schulze mentioned in his documents about Discovery estimation.

That's... useful information to know!   I've just checked Doug's docs and seen some valuable resources there. Great!


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