content_image/999126.jpg content_image/999133.jpg
This configuration, which provides high-availability production cache if you choose to run balanced mode with three copies (R-R-D for both Cluster 0 and Cluster 1), is shown in Figure 5-6. 

<img src='content_image/999126.jpg'>

Another variation of this model uses a TS7700D and a TS7700T or TS7700C for the production site (as shown in Figure 5-7), both replicating to a remote TS7700T or TS7700C with optional object store in the cloud shared by both sites. 

<img src='content_image/999133.jpg'>

In both models, if a TS7700D reaches the upper threshold of usage, the PREFER REMOVE data, which was replicated to the TS7700T or TS7700C, is removed from the TS7700D cache followed by the PREFER KEEP data. PINNED data can never be removed from a TS7700D cache or a TS7700T CP0. 

In the example that is shown in Figure 5-7, you can have particular workloads that favor the TS7700T or TS7700C, and others that favor the TS7700D, suiting a specific workload to the cluster best equipped to perform it. 

