CHECK(IBMIOS,IOS_DYNAMIC_ROUTING) determined that dynamic routing is not fully supported in the storage area network (SAN).

Various routing methods can be used to route I/O requests through the fabric. When dynamic routing is in effect, each I/O can take a different path through the fabric, thereby improving workload balancing. Dynamic routing is a vendor-neutral name for this routing method and each switch vendor has its specific name and implementation.

In order for dynamic routing to function properly, it must be supported on all endpoints within the SAN (that is, the processor and attached controllers); otherwise, an inconsistency can lead to I/O errors. The health check has determined that dynamic routing is enabled in the SAN; however, one or more of the endpoints do not support dynamic routing. The health check report contains additional messages indicating which endpoints are inconsistent. Message IOSHC143I indicates that the processor does not support dynamic routing. Message IOSHC144I lists the node descriptor for each controller identified as not supporting dynamic routing. If the node descriptor is not available, the control unit number will be listed.

The processor and controller firmware need to be at a level that supports dynamic routing, or dynamic routing must be disabled. Refer to the switch vendor documentation to disable dynamic routing in the SAN.