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The Fabric Director monitors the InfiniBand fabric by polling the nodes or elements of the fabric. Each fabric element has a Fabric Director instance, and the two communicate with eachother in a one-to-one relationship. The Fabric Director gathers information about the fabric element through the LDA and ENVD daemons running on the fabric element. From the information gathered, the Fabric Director creates a local SNMP fabricMIB.
One Fabric Director is assigned the role of master. The master Fabric Director gathers information about all of the fabric elements by communicating out-of-band (management network) with the Fabric Directors instances on those fabric elements. This master Fabric Director creates a model of the fabric which is also in the form of an SNMP MIB, as defined by the SUN-FABRIC-MIB specification.
By default, Fabric Directors run in non-master mode. Only when a Fabric Director reads the fabric node list and discovers that its respective fabric element is to host the master Fabric Director, does it become the master Fabric Director.
Fabric Directors generate fabricMIB tables such as:
and also generate fabricMIB scalars such as:
Master Fabric Directors additionally generate fabricMIB tables such as:
and generate fabricMIB scalars such as: