8464ch07_Upgrade.fm Draft Document for Review February 7, 2020 3:15 pm The following methods can be considered: GLYPH<SM590000> Mount or demount to an LVOL  GLYPH<SM590000> COPYRFSH , a  LI REQ  command, based on a single logical volume To produce a new copy, the data must be in cache. If your source cluster is a TS7700T,  consider sorting the logical volumes in a copy order that maps to the physical volume layout.  This sorting improves the performance of the copy action. The  COPYRFSH  processing enables  you to specify a source cluster. Also, prestaging the data to the cache helps to improve the performance. To simplify these  actions, IBM provides some support in the “TAPE TOOL” suite.  For more information about  the performance, see Chapter 11, “Monitoring” on page 625.  The tools are available at this web page. 7.4.3 Considerations for merging an existing cluster or grid into a grid  Figure 7-23 shows a grid merge scenario that involves a two-cluster grid and a three-cluster  grid being merged into a five-cluster grid.  Gigabit LAN/WAN Gigabit LAN/WAN GLYPH<129> All clusters must be at a common code level GLYPH<129> Grid merge requires all clusters within one grid to be inaccessible GLYPH<129> Other grid must have all clusters online GLYPH<129> Maximum of H L J K W  clusters in final grid GLYPH<129> Maximum of 4 million logical volumes. Logical volumes must be unique within grid. TS7700 Cluster TS7700 Cluster TS7700 Cluster TS7700 Cluster Grid A Grid B A TS7700 Cluster Joined Grid Joined LAN/WAN Merge A & B Figure 7-23 Grid merge example 288  IBM TS7700 Release 5.0 Guide