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ESXi hosts intermittently lose access to iSCSI datastores

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fabric-interconnect-and-management-switches
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san
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Applies to

  • NetApp FAS/AFF storage
  • VMware ESXi hosts
  • iSCSI connection to NetApp LUNs
  • Cisco IP switches connecting ESXi hosts and NetApp storage

Issue

  • ESXi hosts intermittently lose access to iSCSI datastores.
  • Host reports errors similar to the following :

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)

 

  • No erroneous events reported in the ems logs except iscsi login events.

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

 

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