The system has determined that the user has zoned the fabric such that this node has received more than 16 unmasked logins originating from another node or node canister - this can be any non service mode node or canister in the local cluster or in a remote cluster with a partnership. An unmasked login is from a port whose corresponding bit in the FC port mask is '1'. If the error is raised against a node in the local cluster, then it is the local FC port mask that is applied. If the error is raised against a node in a remote cluster, then it is the partner FC port masks from both clusters that apply.
More than 16 logins is not a supported configuration as it increases internode communication and can affect bandwidth and performance. For example, if node A has 8 ports and node B has 8 ports where the nodes are in different clusters, if node A has a partner FC port mask of 00000011 and node B has a partner FC port mask of 11000000 there are 4 unmasked logins possible (1,7 1,8 2,7 2,8). Fabric zoning may be used to reduce this amount further, i.e. if node B port 8 is removed from the zone there are only 2 (1,7 and 2,7). The combination of masks and zoning must leave 16 or fewer possible logins.
When this event is logged. the cluster id and node id of the first node whose logins exceed this limit on the local node will be reported, as well as the WWNN of said node. If logins change, the error is automatically fixed and another error is logged if appropriate (this may or may not choose the same node to report in the sense data if the same node is still over the maximum allowed).
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The error is resolved by either re-configuring the system to change which type of connection is allowed on a port, or by changing the SAN fabric configuration so ports are not in the same zone. A combination of both options may be used.
The system reconfiguration is to change the Fibre Channel ports mask to reduce which ports can be used for internode communication.
The local Fibre Channel port mask should be modified if the cluster id reported matches the cluster id of the node logging the error.
The partner Fibre Channel port mask should be modified if the cluster id reported does not match the cluster id of the node logging the error. The partner Fibre Channel port mask may need to be changed for one or both clusters.
SAN fabric configuration is set using the switch configuration utilities.
Use the lsfabric command to view the current number of logins between nodes.
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