Draft Document for Review February 7, 2020 3:15 pm 8464ch05_DisasterRecovery.fm 5.3.3 Planning guidelines As part of planning a TS7700 grid configuration to address this solution, consider the  following points: GLYPH<SM590000> Plan for the necessary WAN infrastructure and bandwidth. You need more bandwidth if  you are primarily using a Copy Consistency Points of RUN or SYNC because any delays  in copy time that are caused by bandwidth limitations result in longer job run times.  GLYPH<SM590000> A factor to consider in the implementation of Copy Export for DR is that the export does  not capture any volumes in the export pool that are not in the TVC of the export cluster.  Any data that is migrated to back-end tape is not going to be on the EXPORT COPY  volumes. GLYPH<SM590000> Plan for host connectivity at your DR site with sufficient resources to run your critical  workloads. If the cluster that is local to the production host becomes unavailable and no  access exists to the DR site’s cluster by this host, production cannot run. Optionally, plan  for an alternative host to take over production at the DR site. GLYPH<SM590000> Design and code the Data Facility System Management Subsystem (DFSMS) automatic  class selection (ACS) routines to control what MC on the TS7700 is assigned. It is these  MCs that control which Copy Consistency Points are used. You might need to consider  MC assignment policies for testing your procedures at the DR site that are different from  the production policies. GLYPH<SM590000> Prepare procedures that your operators can run if the local site becomes unusable. The  procedures include various tasks, such as bringing up the DR host, varying the virtual  drives online, and placing the DR cluster in one of the ownership takeover modes. GLYPH<SM590000> Perform a periodic capacity planning of your tape setup and host throughput to evaluate  whether the disaster setup still can hold the full production workload in a disaster. GLYPH<SM590000> If encryption is used in production, ensure that the disaster site supports encryption. The  EKs must be available at the DR site or the data cannot be read. GLYPH<SM590000> Consider how you test your DR procedures. The following scenarios can be set up: – Test that is based on all data from a TS7700? – What happens if the object store in the cloud becomes unavailable? – Test that is based on stopping production access to one TS7700 cluster and running  production to another cluster? – Test that is based on the use of the  Copy Export function and an empty TS7700? If you have limited bandwidth available between sites, use Deferred Copy Consistency  Point, or copy only the data that is critical to the recovery of your key operations. The  amount of data that is sent through the WAN and the distance it is sent possibly might  justify the establishment of a separate, redundant, and dedicated network only for the  multi-cluster grid. Also, newer IPEX SAN42B-R switches and IP extension hardware are  available that might help with this issue. 208  IBM TS7700 Release 5.0 Guide