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LUNs Mounted from an S2600T V100R005C01 to a Server Are Automatically Disconnected After a Period of Time

Publication Date:  2018-10-17 Views:  253 Downloads:  0
Issue Description
The customer powers on the S2600T and creates RAID groups and LUNs. Then, the customer maps LUNs to the host and prepares to migrate data from the H3C storage system to the S2600T. After that, a LUN is disconnected. The link status of the iSCSI initiator is log off. After logon is performed again, the LUN becomes normal. The customer's network is strictly controlled. Therefore, the possibility of an IP address conflict is low.
Alarm Information
A LUN is disconnected.
Handling Process
According to the solution provided by Huawei, the customer checks the network.

It is found that in the IP SAN environment, the IP address of an unknown device conflicts with the storage service IP address. After the storage service IP address is changed, the problem is solved.
Root Cause
The log file contains a large number of messages indicating nopin link disconnections. No other errors are found.

A network check is recommended. There may be an IP address conflict that causes a disconnection from time to time.

Method: On the host, ping large packets and run the arp -a command to check whether the MAC address is that of the storage system and whether the MAC address changes.

Quick problem identification method: Establish a direct connection.
If you can determine the root cause of a fault during troubleshooting, stick to your point of view and ask the customer to check the operating environment.

After solving the problem based on the solution provided by Huawei, the customer will typically have respect for these professional Huawei engineers.