8464ch01_Intro.fm Draft Document for Review February 7, 2020 3:15 pm Figure 1-3 shows the IBM TS7700D and TS7700 with DS8000 Object Storage TVC  processing.  TVC Host AL0124 AL0123 Virtual Volumes Migrated Volume System z Hosts DS8K Figure 1-3 TS7700D and TS7700 with DS8000 Object Storage Tape Volume Cache processing Another benefit of tape virtualization is the data replication functions. Up to eight IBM TS7700  devices can be interconnected to form a grid. The connections can be through one of the  following sets of links: GLYPH<SM590000> Two or Four 1-gigabit (Gb) Ethernet links (copper) GLYPH<SM590000> Two or Four 10-gigabit per second (Gb) Ethernet links (longwave (LW) fiber) These sets of links form a  multi-cluster grid configuration . Adapter types cannot be mixed in  a cluster, but they  can  vary within a grid, depending on your network infrastructure. Logical  volume attributes and data are replicated across the clusters in a grid. Any data that exists  somewhere in the grid is accessible through any other cluster in the grid configuration.  Through remote volume access, you can reach any virtual volume through any virtual device.  You can reach volumes, even if a replication is not yet made. When two or more cluster types  exist in the same grid, such as a TS7700D and TS7700T, it is referred to as a  HybridGrid . Setting replication policies on the TS7700 determines how many copies are made, where you  want copies to occur, and how you want copies to occur. Each policy can be set at logical  volume granularity, which allows flexibility for workloads. For example, some workloads can  require synchronous replication while others can use asynchronous replication. Also, some  might require no copies while other require many copies. You can group clusters within a grid into  families . Grouping enables the TS7700 to make  improved decisions for tasks, such as replication or TVC selection. Depending on the configuration, multiple TS7700 tape products that form a grid provide the  following benefits: GLYPH<SM590000> High availability (HA) 10  IBM TS7700 Release 5.0 Guide