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Latency events reported on Brocade F-Ports due to ports running at different speeds

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228
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Public
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Category:
fabric-interconnect-and-management-switches
Specialty:
brocade
Last Updated:

Applies to

Brocade Switches

Issue

  • IO_PERF_IMPACT and IO_LATENCY_CLEAR events reported on F-Ports under errdump as shown below:

2022/01/20-20:49:37, [MAPS-1002], 100580, SLOT 1 | FID 128, ERROR, BROCADE, BROCADE_21.E_PORT.192., F-Port 8/0, Condition=ALL_PORTS(DEV_LATENCY_IMPACT==IO_PERF_IMPACT), Current Value:[DEV_LATENCY_IMPACT, IO_PERF_IMPACT, (10 ms Frame Delay) ], RuleName=ALL_PORTS_IO_PERF_IMPACT_UNQUAR, Dashboard Category=Fabric Performance Impact.
2022/01/20-20:50:37, [MAPS-1002], 100581, SLOT 1 | FID 128, ERROR, BROCADE_21, BROCADE_21.E_PORT.192., F-Port 8/0, Condition=ALL_PORTS(DEV_LATENCY_IMPACT==IO_LATENCY_CLEAR), Current Value:[DEV_LATENCY_IMPACT, IO_LATENCY_CLEAR], RuleName=ALL_PORTS_IO_LATENCY_CLEAR, Dashboard Category=Fabric Performance Impact.

  • Slowness issue observed on the application end.
  • Mixed NPIV (virtual) devices configured on the same switch and these constitute speeds of 32G, 16G, 8G.
  • Therefore, there it is inevitable there is going to be a differential in speed and performance on the switch when either or all these devices are sending or receiving frames across this fabric.

switchshow output:

switchName:     Brocade
switchType:     180.0

  14    3   14   670e00   id    N32       Online      FC  F-Port  1 N Port + 1 NPIV public (AoQ)
  15    3   15   670f00   id    N32       Online      FC  F-Port  1 N Port + 3 NPIV public (AoQ)
  16    3   16   671000   id    N32       Online      FC  F-Port  1 N Port + 3 NPIV public (AoQ)
  17    3   17   671100   id    N32       Online      FC  F-Port  1 N Port + 2 NPIV public
  18    3   18   671200   id    N32       Online      FC  F-Port  10:00:00:10:9b:e0:20:00
  19    3   19   671300   id    N32       Online      FC  F-Port  1 N Port + 2 NPIV public
  20    3   20   671400   id    N16       Online      FC  F-Port  1 N Port + 2 NPIV public
  21    3   21   671500   id    N16       Online      FC  F-Port  1 N Port + 3 NPIV public
  22    3   22   671600   id    N16       Online      FC  F-Port  1 N Port + 3 NPIV public
  23    3   23   671700   id    N16       Online      FC  F-Port  1 N Port + 3 NPIV public
  24    3   24   671800   id    N32       Online      FC  F-Port  1 N Port + 4 NPIV public (AoQ)
  25    3   25   671900   id    N32       Online      FC  F-Port  1 N Port + 1 NPIV public (AoQ)
  26    3   26   671a00   id    N8        Online      FC  F-Port  1 N Port + 2 NPIV public
  27    3   27   671b00   id    N8        Online      FC  F-Port  1 N Port + 3 NPIV public

 

 

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