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如何对STIO进行解码:发现挂起的cmd

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适用场景

  • ONTAP 9及更高版本
  • ONTAP 8.3.x
  • ONTAP 8.2 7-模式

问题解答

  • STIO (SCSITarget I/O)消息是SCSI协议级错误、用于帮助、解释和诊断根发生原因中的SCSI相关问题。
  • 如果FC目标适配器在处理期间遇到SCSI命令错误、则会 记录在EMS/消息中。
  • STIO 消息具有不同的含义、可根据命令挂起时检查条件的状态进行解码。

EMS日志示例

STATE 5 : Mon Apr 18 00:37:03 EDT [controller1: fct_tpd_thread_6: fcp.io.status:debug]: STIO Adapter:0a, found hung cmd:0xffffff0200ef83a0(state=5, flags=0x0, ctio_sent=1/1,RecvExAddr=0x127524, OX_ID=0x43xx, RX_ID=0xffff,SID=0x10axx, Cmd[2A])

STATE 8: Tue Aug 16 11:33:01 MST [controller2: fct_tpd_thread_2: fcp.io.status:debug]: STIO Adapter:0f, found hung cmd:0xffffff02023592b0(state=8, flags=0x1, ctio_sent=0/1,RecvExAddr=0x1222b0, OX_ID=0x5dxx, RX_ID=0xffff,SID=0x400xx, Cmd[88])

如上所述、每个状态都有不同的含义、可以使用下表进行解码。

状况:  原因
1 FREE
2 PREPROCESS
3 SCSITCB_WAIT
4 DATAIN_SENT 
5 DATAOUT_WAIT 
6 DATAOUT_RCVD,STIO
7 RESP_SENT 
8 DATAINRESP_SENT 
9 DATAINRESP_CMPL 
10 TERMINATE_WAIT 
11 SCSITMF_WAIT 
12 LAST
13 t

上表可用于诊断问题描述发生在FC目标命令进程中的哪个位置。

例如、为每个状态添加一个小环境:

state=5: DATAOUT_WAIT  这表示在接受写入请求后、FC目标正在等待主机返回内容;但是、预期超时值内未返回任何内容。

state=8: DATAINRESP_SENT  这表示FC目标在接受读取请求后正在等待主机返回内容;但是、在预期超时值内未收到任何有效负载。

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