Chapter 3-6. Detecting Congestion in Fibre Channel Fabrics

发布于:2025-02-11 ⋅ 阅读:(37) ⋅ 点赞:(0)

TxWait History in OBFL

Cisco MDS switches log TxWait history in the Onboard Failure Logging (OBFL) buffer when TxWait increases by 100 ms or more in a 20-second interval. Refer to Example 3-5, which shows the following: TxWait 20 秒间隔内增加 100 毫秒或更多时,Cisco MDS 交换机会在板载故障日志 (OBFL) 缓冲区中记录 TxWait 历史记录。请参阅示例 3-5,其中显示了以下内容:

 The interface and virtual link, if enabled. 接口和虚拟链路(如果启用)。

 The raw TxWait increase (the delta TxWait) in the 20-second sampling period. 20 秒采样时间段内 TxWait 的原始增加值(TxWait delta 值)。

 Raw TxWait converted to seconds. 转换为秒的原始 TxWait

 Percentage Congestion (Percentage TxWait). 拥塞百分比(TxWait 百分比)。

 Date and time. 日期和时间

The last row of Example 3-5 shows that fc9/17 was unable to transmit frames due to lack of Tx B2B credits for 14 seconds in the 20-second monitoring period ending on Apr 21, 2022, at 13:09:27. This is a congestion percentage of 72%. Note that the delta TxWait (5786677) in this 20-second interval is in 2.5 μs ticks. This is actually 14.46 seconds, which is used to calculate the congestion percentage. 3-5 的最后一行显示,在 2022 4 21 13:09:27 结束的 20 秒监控时间段内,fc9/17 14 秒因缺少 Tx B2B 点数而无法传输帧。拥塞百分比为 72%。请注意,在这 20 秒的时间间隔内,TxWait (5786677) 的延迟时间为 2.5 μs ticks。这实际上是 14.46 秒,用于计算拥塞百分比。


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