APC NetBotz 320 Rack Appliance NBRK0320E Manuel D’Utilisation

Like any computing device, your appliance has limited resources available at any point in time to 
perform tasks. If your appliance is configured to perform too many tasks simultaneously – or to 
perform resource-demanding tasks such as image processing and recording more often than is needed 
– its performance will be adversely affected. 

Some symptoms of an overloaded or “busy” appliance include:

• HTTP timeout errors that occur while submitting configuration updates in the Advanced View

• When alert notifications are received, you find that there has been a significant delay between 

the time at which the alert condition occurred and the time at which the alert notification was 
delivered, based on the time of the alert noted in the notification

• Audio clips and/or camera clips that are associated with an alert notification are missing 

• Your appliance reboots on its own

• Changes made to Locale or License Key settings are not retained after the appliance reboots

• In the Camera view, a significantly lower frame rate is being served by the appliance than what 

you expect (this is often due to a heavy alert load, and can also be caused by several users 
attempting to interactively view camera images from the same appliance simultaneously).

• When attempting to load the alerts in the Advanced View Alerts view, you receive an “Error 

loading the list of Alerts” error message.

• When attempting to load sensor graphs you get time-outs.

• Configuration panels take exceedingly long times to load, or time-out when attempting to load.

• Upgrade attempts are unsuccessful with errors indicating that the appliance is too busy.

• When viewing alert details, you receive errors when attempting to load-up graphs and/or 

camera clips with a message indicating that the graph or clip had to be removed in order to 
make room for more recent alert captures. Additionally, expected camera or graph attachments 
for an alert are not present but have instead been completely deleted.

• In the Basic View, you notice a long delay whenever switching focus between tabs or when 

switching sensors in the Sensors View pane.

If your appliance has become overloaded, here are some configuration adjustments you can make that 
will help alleviate the load on the appliance:

• If you are using Device Crawlers or Advanced Device Crawlers, reduce the interval that Device 

Crawlers are being scanned. This setting can be adjusted by selecting the Global SNMP Settings 
task in the Device Crawlers configuration task.

• If you are using Device Crawlers or Advanced Device Crawlers, disable MIB2 scanning on 

devices. Some devices (routers, for example) can include many communications interfaces, and