Advantages and disadvantages of using SNMP and WMI polling

summary

adopt WMI instead of SNMP monitor windows The server's technology represents a measurable but manageable impact on the target and polling engine .

 

On the target server , With simple ping Monitoring compared to , Use WMI and SAM The template is monitored to RAM or CPU There is no effect . however , It means an average increase 12 Kbps.

 

WMI and SNMP The difference between polls is even less obvious ,4 Kbps The only obvious impact is the increase in bandwidth .

 

On the polling engine , The impact is more obvious . By including SAM Template WMI monitor 300 Servers （ The most radical monitoring combination ） And simple to use “ping” Compared with monitoring, the following increases will occur ：

• Average CPU Increased utilization 6%
• Average RAM Increased usage 4%
• Incoming bandwidth increases 4 Mbps

 

Use WMI And SNMP monitor 300 The difference between machines has a small average impact ：

• 6% a central processor
• 2% Memory
• received 2.5 Mbps bandwidth

 

If WMI and SNMP The difference between polls is statistically negligible , So why do you need extra manual operation ？ Why not just switch and leave ？

 

Be careful ： The spreadsheet containing the data behind this information is displayed as a separate upload . See you here ：  SNMP_vs_WMI_20130410.xlsx

 

Environmental Science

NPM 12.4;SAM 6.8;NPM 12.5;SAM 6.9;NPM 2019.4;SAM 2019.4;NPM 2020.2;SAM 2020.2

reason

solve

The answer is that the choice of polling method is in addition to causing physical losses to the machines involved , There are other effects . Functionally , There are some advantages and disadvantages ：

SNMP polling （ And WMI comparison ） 

advantage ：

• Fewer ports for enterprise firewall rules
• Access has no single point of failure
• Use extremely effectively CPU、RAM And bandwidth （ On the target and poller ）

shortcoming ：

• Unable to monitor Windows Volume mount point
• Early versions Windows（NT、W2k） The challenge of
• Additional non-standard configuration operations are required （ Enable SNMP Agent etc. ）
• change SNMP The string needs to be changed enterprise wide
• Use SNMP The service startup time is used as the indicator of normal operation time
  resolvent ： by hrSystemUptime Set up UNDP

WMI polling （ And SNMP comparison ） 

advantage ：

• SAM Settings used automatically
• Use REAL Restart time is used as the indicator of normal operation time

shortcoming ：

• only WMI The device cannot use a custom poller (UNDP).
  resolvent ： If the machine used to be SNMP Polling device , The retention SNMP Information and you can use a custom poller （ At least in the SNMP RO Before string changes ）
• Need more firewall ports
  resolvent ： Each server can be configured to WMI Determined to be only a few ports
• Cannot pass NAT-ed WAN Connect （VPN etc. ） Work
• AD A password change in may weaken monitoring
• Unable to monitor topology
• On the target and poller CPU、RAM And bandwidth utilization efficiency is low （ be relative to SNMP）