Node Group Nodes that are connected to the same tape library.  Normally there is a one-to-one relationship between  a node group and a tape library, so a dual-library  EE cluster has two node groups, at minimum. In  theory, you can divide one tape library into multiple  node groups, just like partitioning. Tape pools are assigned to only one node group,  but a node group can access multiple tape pools. Control Node An EE node that is running in an MMM. IBM  Spectrum Archive EE V1R2 and subsequent  releases require you to configure one control node  per tape library. The control node manages all the  requests for access to its associated tape library.  The control node redirects requests for access to  other tape libraries to the control nodes of the other  tape libraries. Figure 1-5 shows the components that make up IBM Spectrum Archive EE. The components  are shown with IBM Spectrum Scale configured on separate nodes for maximum scalability.  IBM Spectrum Archive EE Scale-out Cluster Tape Library IBM Spectrum Archive EE  Control node 1 IBM Spectrum Scale only nodes Tape Drive Set #1 Tape Drive Set #2 Tape Drive Set #k IBM Spectrum Scale IBM Spectrum  Archive EE HSM MMM IBM Spectrum Archive LE+ HSM MMM IBM Spectrum Archive LE+ HSM MMM IBM Spectrum Archive LE+ Tape Storage Pool Tape Storage Pool Tape Storage Pool IBM Spectrum Scale IBM Spectrum Scale IBM Spectrum Scale IBM Spectrum  Archive EE node 2 IBM Spectrum  Archive EE node k IBM Spectrum  Archive EE IBM Spectrum  Archive EE Figure 1-5 Components of IBM Spectrum Archive EE with separate IBM Spectrum Scale nodes 8  IBM Spectrum Archive Enterprise Edition V1.2.6: Installation and Configuration Guide