Host connectivity
The system reports various information to help the user understand host connectivity and troubleshoot any issues.
For Fibre Channel, FC-NVMe, NVMe over RDMA, and NVMe over TCP-attached hosts, the system reports the node login count, which is the number of nodes that can detect each WWPN or NQN.
To view connectivity for Fiber Channel-attached hosts in the management GUI, select or use the lsfabric command. To view connectivity issues for FC-NVMe, NVMe over RDMA, and NVMe over TCP-attached hosts in the management GUI, select or use the lsnvmefabric command.
For Ethernet-attached hosts, the number of logged-in nodes refers to sessions that are created
between hosts and nodes. The number of logged-in nodes can be greater than the current number of
nodes on the system.
- You can display the login information for each host in the management GUI to determine which ports for the logged-in nodes are connected to the Ethernet-attached hosts. To display this information, select and right-click the host and select IP Login Information.
- To view login information in the command-line interface, use the lshostiplogin to list login session details for a specified host that is logged in to a configured Ethernet port on the system.
- You can also set a status policy and site status to determine how host statuses are displayed. For example, if you select Complete, the system displays an Online status only when all host ports are logged in to all nodes and hosts can access all mapped volumes. If a single host or node loses connectivity, the status for the host displays as Degraded. If you select Redundant for the Status Policy, an Online status is displayed when a sufficient number host ports to node logins exist to retain access to all its mapped volumes, even when a host port or single node is removed or lost.
- If hosts are part of a multiple site configuration, each host needs to be assigned to a specific site and you can specify how host statuses are displayed for these hosts. In the management GUI, you can specify All for Site Status to indicate that host connectivity to the nodes on all sites determine the status of the host. If you select Local for Site Status, the host status relates only to connectivity to nodes on the local site. Host status for other nodes mapped to different sites is not included.