# Why Are the Network Traffic Metric Values in Cloud Eye Different from Those Detected in ECS?

Because the sampling period in Cloud Eye is different from that of the metric monitoring tool in ECS.

Cloud Eye collects ECS and EVS disk data every 4 minutes (5 minutes for KVM ECSs). In contrast, the metric monitoring tool in ECS collects data every second.

The larger the sampling period, the greater the data distortion in the short term. Cloud Eye is more suitable for long-term monitoring for websites and applications running on ECSs.

Furthermore, to improve reliability, you can configure alarm thresholds to enable Cloud Eye to generate alarms where there are resource exceptions or insufficiencies.

Parent topic: Monitored Data Exceptions