Solution when abnormal Fibre Channel connections occur

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Symptom 1: On the ISM GUI, a message is displayed indicating that the initiator is not connected or the port is offline.
Possible cause:
The networking is incorrect.
The optical cable or optical module is faulty.
Recommended action:
Check whether the optical module, optical cable, and networking are correct. Check whether the optical module and optical cable are inserted properly.
Check whether abnormal port information is displayed.
Check whether the logical connection is faulty.

Symptom 2: The networking and hardware is normal. However, on the ISM GUI, a message is still displayed indicating that the initiator is not connected and the port is offline.
Possible causes:
Configuration problem: The rate, port mode, and topology mode do not match.
Host problem: The HBA card drive does not match and the HBA card is faulty.
Recommended action:
Check whether the rate, port mode, and topology mode are correct.
View the message log and check whether there are intermittent disconnection.

Other related questions:
Solution if Fibre Channel links are intermittently disconnected
You can refer to the following case if Fibre Channel links are intermittently disconnected: 1. Issue Description What can I do if Fibre Channel links are intermittently disconnected? 2. Solution When the connection status of Fibre Channel links changes, you can view much information about connection between the storage system and host (or the storage system and switch) based on logs. Then you can check whether there are exceptions such as intermittent disconnection and whether the disconnection is caused by hosts or the storage system. If the disconnection is caused by hosts, check the links between the hosts and switch. If the disconnection is caused by the storage system, check the links between the storage system and switch. The following shows how the connections among the storage system, hosts, and switch are set up: a. Setting up connection between the storage system and hosts Note: The PLOGI command is used to set up connection at the FC2 layer while the PRLI command is used to set up connection to the FC4 layer. After the storage system is connected to host 0x00010b00 at the FC4 layer, a drive reports the linkup event of the port to the upper layer. b. Setting up connection between the storage system and switch Note: The commands FLOGI, PLOGI, RFT_ID, RFT_ID, RFF_ID, and SCR, are used to register the storage system on the switch. 0x000000d4 is PortID of the storage system while 0x22fffffe is PortID of the switch. After registered on the switch, the storage system can set up connection to the hosts. c. The storage system reports the linkup event. Note: A linkup event is reported after the connections between the storage system and hosts/switch are set up. d. The storage system reports the linkdown event. Note: An information TGT_LinkDown is displayed when the storage system is disconnected to the hosts or switch. e. Fibre Channel network nodes change. When the connection status of some nodes in a switch networking changes, the switch sends a registered state change notification (RSCN) to other nodes in the same domain. If the storage system receives RSCN, some hosts or storage systems are disconnected to the switch, or some new nodes are connected to the switch. Note: When the connection status of node 0x000101d4 changes, the switch sends RSCN to the storage system. In addition, the storage system sends GPN_ID to the switch to check whether node 0x000101d4 exists. If the storage system receives CT_RJT, node 0x000101d4 does not exist. Delete resources that connect to the node.

Solution when a disk failure occurs
Solution when a disk failure occurs: Troubleshooting: 1. If the disk is not removed and inserted, collect the S.M.A.R.T information of the disk and send the information to the R&D for analysis. 2. Apply for spare parts and replace the faulty disk.

Solution when a RAID group is abnormal
Check the event information on ISM and determine the reason why the RAID group is degraded due to disk failures. Bit error isolation Note: Check whether there are events indicating excessive bit errors related to the disk. If yes, the disk may be isolated due to excessive bit errors. Troubleshooting: Analyze the SES log and determine why there are excessive bit errors. Disk fault Note: The disk fault cannot be rectified. As a result, accessing the disk fails and disk rejection occurs. Troubleshooting: Replace the faulty disk. Disk enclosures are offline. Note: If a RAID group consists of disks from different enclosures and disk enclosures are offline, the RAID group will be degraded or fail. Recommended action: Check whether the disk enclosures are offline.

Whether the port bonding is supported for Fibre Channel host ports on OceanStor T Series storage systems
OceanStor V100R005 T series storage systems do not support the bonding of Fibre Channel host ports.

Problem and solution when the OSPF status is abnormal
To solve the problem that the OSPF status between the firewall and the peer device cannot reach the Full state, perform the following steps: 1. Check the OSPF status. Check whether the OSPF neighboring relationship can be established between the firewall and the peer device. 2. If no, check the security policy configuration. Check whether the security policy control function for unicast packets is enabled. That is, check whether the firewall packet-filter basic-protocol enable command is configured. If yes, run the undo firewall packet-filter basic-protocol enable command to disable the function. To establish an OSPF neighboring relationship, devices need to exchange DD packets. DD packets are OSPF unicast packets. By default, the forwarding of OSPF unicast packets is not controlled by security policies. However, if you run the firewall packet-filter basic-protocol enable command to enable the security policy control function for OSPF unicast packets, you need also to configure the corresponding security policy to allow the packets to be forwarded. For details, see OSPF can not step into full state caused by security policy deny.

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