Network/Server Performance Monitoring

These are the questions asked during Network/Server Performance Monitoring Training


  • Will it monitor an exchange/Office 365 hybrid environment?OpManager can to Exchange servers. For Office 365 monitoring, we recommend APM plugin.
  • Is file monitoring only available for Windows?Yes. Since it is limited to WMI, it is available only for Windows.
  • Nutanix runs in a CentOS environment, would it be able to monitor that?We can monitor if it responds to SNMP OID. As per this link, we can configure SNMP and add few metrics. Please refer this video and contact support for further assistance.
  • What is exactly total traffic for an interface ? Is it the total traffic from the specific point in time until another point in time?It is based on the polling interval. If Interface polling interval is 15 mins, then the last polled value is the traffic in between the two consecutive polls.
  • How can I know the total amount of traffic through an interface from time 1 to time 2 ? Is there a report?You can choose the time period in reports and pull the data based on this.
  • Is it possible to make a script run from a specific device instead of the monitoring server and I'm talking here about Microsoft windows devices?For Windows devices, script has to be executed locally but there is are workarounds like psexec(third party) or an option in Powershell where a block of code can be executed on a remote server. This psexec or Powershell script might run locally on windows server but it can call the remote script or run the block of code on a remote server.
  • What should I do when I discover a vCenter and in "virtual details" it shows the esxi host, but it doesn't start monitoring automatically? DNS records are correct. How can I force start monitoring it?  Rediscovering vCenter, deleting and readding vCenter doesn't help alsoYes it won't help, as DNS name is not updated so deleting and rediscovery will again do the same thing. But if do update the dnsname then in the next scheduled discovery of vCenter, it will automatically start monitoring the corrected ESXServer

    If you correct the DNS Records it would be great, but in case its not correct you can force start monitoring by going to vCenter snapshot page -> Host List Widget and in the end there is Monitoring Column, from there on you can give IP and start monitoring it. Also, in our next releases we are going to do away with DNS Name dependency we are going to rely on the Entity Name only.
  • I have 6 ESX host, however one doesn't show up under Virtualization / VMware-Host. How do I add it to that section?That section only shows the monitored ESX Server's. You can go to vCenter snapshot page and see the complete list of ESXServers mapped to that vCenter.
  • Why does SNMP write have to be enabled for IPSLA?OpManager need to push the IPSLA settings on the network device using SNMP write.
  • What permissions are required by the vmware vcenter credentials?HTTPs credential for VMware vCenter with ReadOnly Permission are enough to monitor vCenter.
  • What is the quickest/easiest way to identify against which IP or interface the DOS attack is against from my main router, I am also using your product netflow?In NetFlow, you can see the source IPs in 'Offender' tab under attacks event drill down. You can see about the interface details under 'Field Details' tab (Unique IN interfaces and Unique OUT interfaces) under attacks event drill down.
  • What happens if the OpManager Server Hard Disk goes full, how can we free Space on Server?NFA specific hard disk space usage reduction can be done by setting proper data retention period under Settings->NetFlow->Storage Settings.
    Data retention period for Raw data , Aggregated data and One Min data can be set there.
  • If someone DOS attacks me, how can i see the network utilization in for example last 3 minutes to solve the problem quickly, not in last 1hour. If I view it in last 1 hour then its very hard to notice the massive peak in my network.- Note down the Offender IP and Interface name from attacks drill down.
    - Go to Reports -> Custom Search Reports
    - Select that interface and give the offender IP value for 'Source Address' criteria and select the desired time frame.
    - Click 'Generate report'
    - If Raw data is enabled , then more detailed report can be seen under Reports -> Forensics Reports
  • What constitutes a license for a monitored device? i.e. = Physical Server / Virtual Host (HYPER-V)? –> Virtual Machines?The license for a monitored Virtual Host or Virtual Machines are same as Physical Server. There is no difference in it. One Device - One License.
  • How can we monitor VPN connections in a Cisco ASA and create a view of this?You can create your own monitors for SNMP-enabled devices, detailed steps are available in this link: http://help.opmanager.com/add_custom_monitors_api-v12
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