8464ch04_Planning.fm Draft Document for Review February 7, 2020 3:15 pm For TS7700 clusters that are configured in a grid, the following extra assignments must be  made for the grid WAN adapters. For each adapter port, you must supply the following  information: GLYPH<SM590000> A TCP/IP address GLYPH<SM590000> A gateway IP address GLYPH<SM590000> A subnet mask Note:  In a TS7700 multi-cluster grid environment, you must supply two or four IP  addresses per cluster for the physical links that are required by the TS7700 for grid  cross-site replication. DNS must be configured in the Cluster Network Settings (under Management Interface  corresponding window) if the selected Cloud Object Store is Amazon S3. The TS7700 provides up to four independent 1 Gb copper (RJ-45) or SW fiber Ethernet links  for grid network connectivity, or up to four 10 Gb LW links. To be protected from a single point  of failure that can disrupt all WAN operating paths to or from a node, connect each link  through an independent WAN interconnection. Note:  For new deployments, it is a strongly preferred practice that each of the up-to-four  grid interfaces exists on discrete subnets. Plan different subnets for each grid interface. If  the grid interfaces are directly connected (without the use of Ethernet switches), you must  use separate subnets. You must provide three TCP/IP addresses on the same subnet. Two of these addresses are  assigned to physical links, and the third is a virtual IP address that is used to connect to the  TS7700 MI. All three provided IP addresses are assigned to one TS7700 cluster for MI  access. Local IP addresses for Management Interface access Use the third IP address to access a TS7700. It automatically routes between the two  addresses that are assigned to physical links. The virtual IP address enables access to the  TS7700 MI by using redundant paths, without the need to specify IP addresses manually for  each of the paths. If one path is unavailable, the virtual IP address automatically connects  through the remaining path. You must provide one gateway IP address and one subnet mask address. Note : If FC 9900, Tape Encryption configuration, is installed, this same connection is used  for communications between the TS7700 and the Encryption Key Server or Tivoli Key  Lifecycle Manager (TKLM). Because encryption occurs on attached physical tape drives,  encryption support does not exist for non-tape attached instances of the TS7700, and the  virtual connection is used exclusively to create redundant paths. Each cluster in the grid must be configured in the same manner, with three TCP/IP addresses  providing redundant paths between the local intranet and cluster.  146  IBM TS7700 Release 5.0 Guide