## 9.6.3 Moving to a new IBM FlashSystem 9100 cluster 

You might have a highly populated, intensively used IBM FlashSystem 9100 cluster that you want to upgrade. You might also want to use the opportunity to overhaul your IBM FlashSystem 9100 and SAN storage environment. 

Complete the following steps to replace your cluster entirely with a newer, bigger, and more powerful one: 

1. Install your new IBM FlashSystem 9100 cluster. 

2. Create a replica of your data in your new cluster. 

3. Migrate your servers to the new IBM FlashSystem 9100 cluster when convenient. 

If your servers can tolerate a brief, scheduled outage to switch from one IBM FlashSystem 9100 cluster to another, you can use the IBM FlashSystem 9100 remote copy services (Metro Mirror or Global Mirror) to create your data replicas, following these steps: 

1. Select a host that you want to move to the new IBM FlashSystem 9100 cluster and find all the old volumes you must move. 

2. Zone your host to the new IBM FlashSystem 9100 cluster. 

3. Create remote copy relationships from the old volumes in the old IBM FlashSystem 9100 cluster to new volumes in the new IBM FlashSystem 9100 cluster. 

4. Map the new volumes from the new IBM FlashSystem 9100 cluster to the host. 

5. Discover new volumes on the host. 

6. Stop all I/O from the host to the old volumes from the old IBM FlashSystem 9100 cluster. 

7. Disconnect and remove the old volumes on the host from the old IBM FlashSystem 9100 cluster. 

8. Unmap the old volumes from the old IBM FlashSystem 9100 cluster to the host. 

9. Make sure remote copy relationships between old and new volumes in the old and new IBM FlashSystem 9100 cluster are synced. 

10.Stop and remove remote copy relationships between old and new volumes so that the target volumes in the new IBM FlashSystem 9100 cluster receive read/write access. 

11.Import data from the new volumes and start your applications on the host. 

If you must migrate a server online, instead, you must use host-based mirroring by completing these steps: 

1. Select a host that you want to move to the new IBM FlashSystem 9100 cluster and find all the old volumes that you must move. 

2. Zone your host to the new IBM FlashSystem 9100 cluster. 

3. Create volumes in the new IBM FlashSystem 9100 cluster of the same size as the old volumes in the old IBM FlashSystem 9100 cluster. 

4. Map the new volumes from the new IBM FlashSystem 9100 cluster to the host. 

5. Discover new volumes on the host. 

6. For each old volume, use host-based mirroring (such as AIX mirrorvg ) to move your data to the corresponding new volume. 

7. For each old volume, after the mirroring is complete, remove the old volume from the mirroring group. 

