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在 EMS 中出现 IO WQE 故障时、 FC LUN 的延迟较高

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状态信息

适用场景

  • ONTAP 9
  • FCP
  • Brocade 交换机
  • Cisco 交换机

问题描述

  • 通过FCP访问LUN的主机上的工作负载会产生大量应用程序和客户端延迟
  • EMS日志中的IO wqe频繁出现故障。

示例:

Mon Feb 10 00:28:21 +03 [NODE01: fct_tpd_work_thread_0: fcp.io.status:debug]: STIO Adapter:10a IO WQE failure, Handle 0x2, Type 8, S_ID: 20253, VPI: 18, OX_ID: 263, Status 0x3 Ext_Status 0x1d

  • 无法访问AFF SAN上的Storage Virtual Machine数据LUN
  • 在FC LUN上间歇性观察到高延迟
  • Brocade交换机反复报告因信用丢失和特定端口上的C3 Tx丢弃或超时而导致链路重置 porterrshow

/fabos/cliexec/porterrshow:

          frames      enc    crc    crc    too    too    bad    enc   disc   link   loss   loss   frjt   fbsy  c3timeout    pcs    uncor

       tx     rx      in    err    g_eof  shrt   long   eof     out   c3    fail    sync   sig                  tx    rx     err    err

  0:   89.4m 139.8m   0      0      0      0      0      0      0     1.3k   0      0      0      0      0     1.3k   0      0      0  

  • Fabriclog 为该特定端口记录输出链路重置事件下的Cisco交换机 

Switch 0; Thu Jul 28 00:00:18 2022 GMT (GMT+0:00)

00:02:11.754993 SCN LR_PORT(0);g=0x266 LR_IN         D2,P0  D2,P0  0    NA   
00:02:26.934854 SCN LR_PORT(0);g=0x266 LR_OUT         D2,P0  D2,P0  0    NA   
00:02:39.918129 SCN Port Offline;rsn=0x4,g=0x268       D2,P0  D2,P0  0    NA   
00:02:39.918135 *Removing all nodes from port         D2,P0  D2,P0  0    NA   
00:02:40.770569 SCN LR_PORT(0);g=0x268            D2,P0  D2,P0  0    NA   
00:02:40.773044 SCN Port Online; g=0x268,isolated=0      D2,P0  D2,P1  0    NA 

  • fcp adapter stats -node <node_name> -adapter 1a -instance
    • 指示与存储相邻的任何协议层问题描述
  • network fcp adapter show 在ONTAP 命令行界面上显示低Tx功率:

Received Optical Power   570.7 (uWatts)
SPF Transmitted Optical Power   123.8 (uWatts)

 

 

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