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Kernel reported iSCSI connection 1:0 error (1011) state (1) エラーで iSCSI 接続が断続的に失敗する

Solution Verified - Updated -

Issue

  • iSCSI デバイスへの接続が定期的に失敗し、以下のエラーメッセージが /var/log/messages ファイルにログ記録されます。

    Jan  2 18:17:12 node1 iscsid:Kernel reported iSCSI connection 1:0 error (1011) state (3)
    Jan  2 18:17:12 node1 iscsid:Kernel reported iSCSI connection 1:0 error (1011) state (1)
    Jan  2 18:17:14 node1 kernel:session1: target reset succeeded
    Jan  2 18:17:15 node1 iscsid: connection1:0 is operational after recovery (1 attempts)
    Jan  2 18:17:24 node1 kernel: sd 5:0:0:6: timing out command, waited 30s
    Jan  2 19:23:26 node1 kernel:connection1:0: detected conn error (1011)
    Jan  2 19:23:27 node1 kernel:connection1:0: detected conn error (1011)
    Jan  2 19:23:27 node1 iscsid:Kernel reported iSCSI connection 1:0 error (1011) state (3)
    Jan  2 19:23:27 node1 iscsid:Kernel reported iSCSI connection 1:0 error (1011) state (1)
    
  • この問題は、ナレッジベース 45167 の手順に従って tcp_window_scaling を無効にし、ナレッジベース 36141 に従って iSCSI イニシエーターのタイムアウト値を増やした後も繰り返し発生します。

Environment

  • Red Hat Enterprise Linux 5.6
  • iSCSI SAN

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