APC NBRK0320E Datasheet download pdf (Page 203)

Overloaded Appliances: Symptoms & Solutions

194 Using Your Appliance

scanning all MIB2 interfaces on these devices can cause significant delays on Device Crawlers

performance. To avoid these impacts, disable MIB2 scanning on these devices.

• Lower the Interactive Frame Rate Limit on some or all cameras connected to the appliance (start the

cameras task, select a camera, and then click Settings). This value specifies what percentage of the

total images made available per second by the camera that will be made available to users that are

using the appliance interactively (such as viewing images from the Cameras View in the Advanced

View). This can be used to limit the performance impact that can be caused by multiple clients with

high frame rate settings accessing your appliances interactively

• If Camera Motion thresholds are enabled for alerting, check the following to ensure that thresholds

and settings are appropriate such that camera motion is not being detected continuously:

– Check the Sensitivity and Area of Motion settings to ensure those are set appropriately for your

environment and the type of motion that you're interested in detecting

– If there are areas of the image that are “noise” (such as windows with traffic passing by in

background, or monitors with screen savers running) or that you don't care to detect motion in,

use the Camera Pods task’s Motion configuration to create a Motion Detection Mask for those

areas.

– If Camera Motion thresholds (or any other thresholds that include camera images) are being

triggered frequently, adjust the thresholds to make them less sensitive. You can also use Alert

State for Time alert types instead of Alert State alert types to try to minimize duplicate event

notifications.

– If there are time periods where you wish to ignore motion events, use the Advanced Scheduling

option within the Camera Motion threshold to disable the sensor for specific time periods on

specific days of the week.

• Adjust the Capture settings for your Camera Pods to reduce the capture size of pictures being

collected.

• If you have several “busy” Camera Pods connected to one appliance and have multiple appliances

available, try distributing the cameras to the other appliances to even out the image capture load.

• If possible, spread out the initialization of alert notifications over the span of a few minutes, instead

of sending a bunch all at the same time. This can be accomplished by using multiple alert levels in

the Alert Profile.

• Overall Alert Load: If your appliance is detecting more than a couple of alert events every few

minutes, you may need to re-evaluate your alert threshold settings in order to ensure that alerts are

meaningful. Additionally, if you have several alert actions configured and they are running on short

intervals, you might consider breaking those out into longer intervals or creating multiple profiles

that can be customized for different sensor types. This would allow for sensors which will collect

picture captures to have notifications sent on different intervals (and with different alert actions)

than other sensors which might not require picture captures.

• If you are running in wireless mode, or in SSL mode, these modes will consume more processing

power than in a non-wireless or non-SSL mode. As a result, image captures or interactive viewing

of Camera images will have an even greater affect on the performance. In this case, it is even more

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APC NBRK0320E Datasheet Page 203