Dell PowerEdge M1000e Fabric OS Administrator’s Guide - Page 457
Supported configurations for bottleneck detection, How bottlenecks are reported
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Bottleneck detection 18 NOTE Bottleneck detection is disabled by default. Best practice is to enable bottleneck detection on all switches in the fabric, and leave it on to continuously gather statistics. Supported configurations for bottleneck detection Note the following configuration rules for bottleneck detection: • Bottleneck detection is supported only on Fibre Channel ports and FCoE F_Ports. • Bottleneck detection is supported only on the following port types: - E_Ports - EX_Ports - F_Ports - FL_Ports • F_Port and E_Port trunks are supported. • Long distance E_Ports are supported. • FCoE F_Ports are supported. • Bottleneck detection is supported on both 4 Gbps and 8 Gbps platforms. • Bottleneck detection is supported in Access Gateway mode. • Bottleneck detection is supported whether Virtual Fabrics is enabled or disabled. In VF mode, bottleneck detection is supported on all fabrics, including the base fabric. See "Virtual Fabrics considerations for bottleneck detection" on page 418 for additional information on using bottleneck detection in VF mode. How bottlenecks are reported Bottlenecks are reported through RASlog alerts and SNMP traps. You can set alert thresholds for the severity and duration of the bottleneck. You can also use a CLI command to display a history of bottleneck conditions on a port. A history is maintained for a maximum of three hours for each port. Limitations of bottleneck detection Using this feature for latency bottleneck detection is not recommended for link utilizations above 85%. The bottleneck detection feature detects latency bottlenecks only at the point of egress, not ingress. For example, for E_Ports, only the traffic egressing the port is monitored. For FCoE ports, bottleneck detection monitors traffic going from the FC side to the CEE side, and does not monitor traffic going in the reverse direction. High availability considerations for bottleneck detection The bottleneck detection configuration is maintained across a failover or reboot; however, bottleneck statistics collected are lost. Fabric OS Administrator's Guide 417 53-1001763-02
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