Why are network delays being reported?

admin

Administrator
#1
I see the ScaleOut service reporting network interruptions in the system event log. My network appears to be running well, however… what could be causing these incidents?
 

admin

Administrator
#1
The ScaleOut StateServer service may report networking problems when it detects when network heartbeats between hosts aren't delivered for an extended period of time. While a slow/congested network is often a cause of delayed traffic, other factors may also contribute to delays and be interpreted as a networking problem by the service. For example:
  • Heavy paging caused by insufficient memory on a server can cause the SOSS service to be swapped to disk and delay its ability to send/receive network heartbeats.
  • Heavy CPU load caused by other processes on the system can starve the SOSS service and delay its ability to send/receive network heartbeats.
Other common causes of network slowdowns can include the following:
  • Network intrusion products often install drivers in the network stack that examine every network packet and thus delay delivery—a backlog can even occur under heavy enough network load. If you look at your network adapters’ properties and see a third-party security product or firewall in the list of enabled services then you should temporarily disable it and evaluate whether ScaleOut’s performance stabilizes. (Note that ScaleOut is unaffected by virus checkers—the product does not rely on disk access at all. Only interference in the network stack counts here.)
  • Outdated network drivers may cause poor performance. Verify that you are running the latest drivers from your hardware vendor.
  • If NIC teaming is being used, try temporarily disabling it to see if network performance improves. If so, consider using a different teaming strategy.
  • If some hosts in the farm are connected through multiple switches, delays can arise when the link between switches becomes congested. If possible, connect all of the hosts to the same network switch.
 
Top