Draft Document for Review February 7, 2020 3:15 pm 8464ch08_Migrate.fm Figure 8-2 TS7700: Grid to Grid Migration overview The following main components are shown in the GGM overview that is shown in Figure 8-2: CSG Copy Source Grid  CTG Copy Target Grid Proxy server A binary program that is installed in the CSG through  vtd_exec , which  enables the CTG to communicate with the CSG The GGM tool should be considered whether the following situations are true: GLYPH<SM590000> Six clusters exist in the installed in the grid. GLYPH<SM590000> The Join and Copy Refresh processing cannot be used (floor space requirements,  microcode restrictions, and other considerations must be met).  GLYPH<SM590000> CSG and CTG are maintained by different providers. GLYPH<SM590000> GGM is based on  LI REQ  commands. All commands are run on the  Cluster Target Grid (CTG). The CTG must have at least R3.3 installed.  GLYPH<SM590000> It is single logical volume-based.  LI REQ  commands (which belong to the M2 command  class) must be run for  each  logical volume that must be copied. The quantity of requests  (50 is the maximum) that can be concurrently processed in the M2 class level is limited.  For more information about related constraints and how to correctly manage the  corresponding queue, see 10.1.3, “Host Console Request function” on page 597. GLYPH<SM590000> A volume to be copied by GGM must be in the  Cluster Source Grid  (CSG). If no copy is in  this cluster, the logical volume cannot be copied, even if other clusters in the source grid  include a copy. The minimum microcode level for a CSG is R2.1. GLYPH<SM590000> The logical volume serial number is kept during the copy process, so all volume ranges  that are copied must be unique in the grids.  GLYPH<SM590000> The CTG pulls a copy of the logical volume from the CSG. When this copy is pulled  (depending on the MC content in the CTG) more copies might be produced in the CTG. GLYPH<SM590000> GGM traffic between the two participating grids is unencrypted. This condition persists  even if Secure Data Transfer (SDT) is locally enabled for each CSG and CTG grids. GLYPH<SM590000> After a logical volume is successfully copied to all clusters in the CTG, a broadcast  message can be issued to all attached LPARs. Depending on the logical scenario, the  customer must run actions manually.  Consider the following points regarding the GGM tool: Considerations for GGM Chapter 8. Migration  305