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Brocade switch has port bandwidth oversubscribed on an F-Port

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Category:
fabric-interconnect-and-management-switches
Specialty:
brocade
Last Updated:

Applies to

  • Brocade SAN switch
  • Fabric OS (FOS)
  • Monitoring and Alerting Policy Suite (MAPS)

Issue

  • errdump or Web Tools shows PORT_BANDWIDTH==OVERSUBSCRIBED alerts similar to:
Condition=ALL_PORTS(PORT_BANDWIDTH==OVERSUBSCRIBED), Current Value:[PORT_BANDWIDTH, OVERSUBSCRIBED, (TXQL=464 us, TX=96.5%) ], RuleName=defALL_PORTS_OVERSUBSCRIBED, Dashboard Category=Fabric Performance Impact, Quiet Time=15 min.
  • mapsdb --show has rule violations related to defALL_PORTS_OVERSUBSCRIBED:
3.2 Rules Affecting Health:
===========================
Category(Violation Count)|RepeatCount|Rule Name  |Execution Time   |Object  |Triggered Value(Units)|
----------------------------------------------------------------------------------------------------
Fabric Performance Impact|1          |defALL_PORTS_OVERSUBSCRIBED|02/22/24 18:25:57|F-Port 59      |OVERSUBSCRIBED        |
  • The affected ports are F-Ports attached to hosts with 8G bandwidth:
/fabos/bin/switchshow :
[...]
Index Port Address  Media Speed   State       Proto
==================================================
  59  59   043b00   id    N8   Online      FC  F-Port  1 N Port + 6 NPIV public 
  • The storage these hosts are accessing has 32G bandwidth:
/fabos/bin/switchshow :
[...]
Index Port Address  Media Speed   State       Proto
==================================================
0   0   040000   id    N32   Online      FC  F-Port  1 N Port + 5 NPIV public
  • The host and storage are attached to the same switch.

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