Fabric OS Administrator’s Guide
417
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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.
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Страница 54: ...14 Fabric OS Administrator s Guide 53 1001763 02 High availability of daemon processes 1 ...
Страница 74: ...34 Fabric OS Administrator s Guide 53 1001763 02 Basic connections 2 ...
Страница 102: ...62 Fabric OS Administrator s Guide 53 1001763 02 Audit log configuration 3 ...
Страница 156: ...116 Fabric OS Administrator s Guide 53 1001763 02 The authentication model using RADIUS and LDAP 5 ...
Страница 214: ...174 Fabric OS Administrator s Guide 53 1001763 02 Management interface security 7 ...
Страница 228: ...188 Fabric OS Administrator s Guide 53 1001763 02 Brocade configuration form 8 ...
Страница 276: ...236 Fabric OS Administrator s Guide 53 1001763 02 Creating a logical fabric using XISLs 10 ...
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Страница 440: ...400 Fabric OS Administrator s Guide 53 1001763 02 Performance data collection 17 ...
Страница 464: ...424 Fabric OS Administrator s Guide 53 1001763 02 Disabling bottleneck detection on a switch 18 ...
Страница 480: ...440 Fabric OS Administrator s Guide 53 1001763 02 F_Port masterless trunking 19 ...
Страница 494: ...454 Fabric OS Administrator s Guide 53 1001763 02 Buffer credit recovery 20 ...
Страница 560: ...520 Fabric OS Administrator s Guide 53 1001763 02 Port indexing on the Brocade DCX 4S backbone C ...
Страница 574: ...534 Fabric OS Administrator s Guide 53 1001763 02 Hexadecimal overview E ...