ESXiホストがiSCSIデータストアに断続的にアクセスできなくなります

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環境

NetApp FAS / AFFストレージ
VMware ESXiホスト
NetApp LUNへのiSCSI接続
ESXiホストとネットアップストレージを接続するCisco IPスイッチ

問題

ESXiホストがiSCSIデータストアに断続的にアクセスできなくなります。
ホストから次のようなエラーが報告されます。

Apr 7 06:10:42 va1plxld001 iscsid: iscsid: Kernel reported iSCSI connection 12:0 error (1022 - ISCSI_ERR_NOP_TIMEDOUT: A NOP has timed out) state (3) Apr 7 06:10:42 va1plxld001 iscsid: iscsid: connection14:0 is operational after recovery (3 attempts) Apr 7 06:10:44 va1plxld001 kernel: connection11:0: ping timeout of 5 secs expired, recv timeout 5, last rx 6465840173, last ping 6465845184, now 6465850192 Apr 7 06:10:44 va1plxld001 kernel: connection11:0: detected conn error (1022) Apr 7 06:10:44 va1plxld001 kernel: connection10:0: ping timeout of 5 secs expired, recv timeout 5, last rx 6465840173, last ping 6465845184, now 6465850192 Apr 7 06:10:44 va1plxld001 kernel: connection10:0: detected conn error (1022) Apr 7 06:10:44 va1plxld001 iscsid: iscsid: Kernel reported iSCSI connection 11:0 error (1022 - ISCSI_ERR_NOP_TIMEDOUT: A NOP has timed out) state (3) Apr 7 06:10:44 va1plxld001 iscsid: iscsid: Kernel reported iSCSI connection 10:0 error (1022 - ISCSI_ERR_NOP_TIMEDOUT: A NOP has timed out) state (3) Apr 7 06:10:45 va1plxld001 iscsid: iscsid: connection23:0 is operational after recovery (3 attempts) Apr 7 06:10:45 va1plxld001 iscsid: iscsid: connection24:0 is operational after recovery (3 attempts) Apr 7 06:10:45 va1plxld001 iscsid: iscsid: connection13:0 is operational after recovery (4 attempts) Apr 7 06:10:49 va1plxld001 iscsid: iscsid: connection9:0 is operational after recovery (6 attempts) Apr 7 06:10:50 va1plxld001 iscsid: iscsid: connection19:0 is operational after recovery (6 attempts) Apr 7 06:10:50 va1plxld001 iscsid: iscsid: connection20:0 is operational after recovery (6 attempts)

iSCSIログインイベント以外のエラーイベントはEMSログで報告されません。

Mon Apr 7 10:05:04 EDT [netapp-01: iswt_admin_thread: iscsi.notice:notice]: ISCSI: New session from initiator iqn.1994-05.com.redhat:902ac996c6f4 at IP addr 10.72.220.35 Mon Apr 7 10:05:16 EDT [netapp-01: iswt_admin_thread: iscsi.notice:notice]: ISCSI: New session from initiator iqn.1994-05.com.redhat:902ac996c6f4 at IP addr 10.72.220.36