ONTAP FC端口显示低接收功率(RX)值

• ONTAP
• FCP
• Brocade SAN 交换机
• Cisco SAN 交换机

• 根据fcp adapter show 输出、FC端口在ONTAP上显示的RX值较低：

::> fcp adapter show -instance -node nodename -adapter 0a [...] Received Optical Power: 241.3 (uWatts) Is Received Power In Range: false SFP Transmitted Optical Power: 600.4 (uWatts) Is Xmit Power In Range: true DDM Status: 30 Is Xmit Disabled: false  Is Xmit In Fault: false Is Receiver In LOS: false

• FCP-Adapter.xml 登录 ONTAP报告低Rx功率，指示问题描述上游到ONTAP：

• AIQM-中报告的风险低于
  •  RISK: SFP receive power of the SFP connected to netapp port 9c is below the recommended value. 

•SFP在两端均显示良好。在两端、Tx和Rx均在建议范围内。

• 在EMS 日志中、我们观察到link break detected 和link up 错误以及 AEN 错误：

Wed Apr 12 03:42:08 +0200 [nxx-0x: fct_tpd_work_thread_0: scsitarget.slifct.linkBreak:error]: Link break detected on Fibre Channel target HBA 2c with event status 1 , topology type 1, status1 0x0, status2 0x0.

Wed Apr 12 03:42:09 +0200 [nxx-0x: fct_tpd_work_thread_0: scsitarget.hwpfct.linkUp:notice]: Link up on Fibre Channel target adapter 2c.

fcp.io.status:debug]: STIO Adapter:0e AEN 0x8048 (RECV_ERROR) MboxStatus1 0x1002 MboxStatus2 0xa1

• 从Brocade交换机的sfpshow 日志中：

RX Power:   -1.9   dBm (647.5uW) 
TX Power:   -4.6   dBm (349.3 uW)

• `show interface brief`logs 在连接到受影响NetApp端口的Cisco交换机上、交换机端口状态报告为"errDisabled "

-----------------------------------------------------------------------------------------
Interface  Vsan   Admin  Admin   Status     SFP   Oper  Oper   Port    Logical
          Mode   Trunk             Mode  Speed  Channel   Type
             Mode                (Gbps)
-----------------------------------------------------------------------------------------
fc1/27    3    auto   off   errDisabled swl   --    --    --     --

• show int transceiver detail Cisco交换机上的输出报告Tx功率低、表示交换机端SFP存在问题：

   SFP Diagnostics Information:
----------------------------------------------------------------------------
                   Alarms          Warnings
                 High     Low      High      Low
----------------------------------------------------------------------------
  Temperature   40.16 C      75.00 C    -5.00 C    70.00 C     0.00 C
  Voltage     3.33 V       3.63 V    2.97 V    3.46 V     3.13 V
  Current     0.00 mA      12.00 mA    4.00 mA   11.20 mA     4.80 mA
 Tx Power    -40.00 dBm     5.00 dBm  -12.20 dBm   2.00 dBm    -8.20 dBm 
  Rx Power    -0.49 dBm      5.00 dBm  -15.20 dBm   2.00 dBm   -11.20 dBm 
  Transmit Fault Count = 0
----------------------------------------------------------------------------
  Note: ++  high-alarm; +  high-warning; --  low-alarm; -  low-warning

• Cisco交换机上端口的Rx和Tx值显示为最佳、且端口状态为已启动。

fc2/42 is up
[...
....]
Temperature 38.33 C, Voltage 3.38 V, Current 6.54 mA, TxPower -6.08 dBm, RxPower -3.11 dBm

• 交换机端的端口已切换、但NetApp端的FC端口上的Rx电源仍低。

Tue May 28 23:35:39 2024:type=update:id=10.0.xx.xyz@pts/0:user=admin:cmd=configure terminal ; interface fc2/42 (SUCCESS)
Tue May 28 23:35:57 2024:type=update:id=10.0.xx.xyz@pts/0:user=admin:cmd=Interface fc2/42 state updated to down
Tue May 28 23:35:57 2024:type=update:id=10.0.xx.xyz@pts/0:user=admin:cmd=configure terminal ; interface fc2/42 ; shutdown (SUCCESS)
Tue May 28 23:41:05 2024:type=update:id=10.0.xx.xyz@pts/0:user=admin:cmd=Interface fc2/42 state updated to up
Tue May 28 23:41:05 2024:type=update:id=10.0.xx.xyz@pts/0:user=admin:cmd=configure terminal ; interface fc2/42 ; no shutdown (SUCCESS)

• System Manager中的适配器吞吐量较低
• 作为故障排除的一部分、可以执行以下步骤：
  • ONTAP上的低RX通常表示  传输端(交换机/配线板)存在硬件故障
  • 执行电缆测试以及配线板、以检查电缆是否运行正常
  • 将电缆交换至交换机端另一个打开的工作端口、以查看问题是否出在该端口上
  • 清洁电缆和两个SFP上的连接