Figure 9-5 shows a configuration of a single home cluster with multiple cache clusters to form  a Centralized Archive Repository. IBM Spectrum Scale  Cluster Cache site 1 IBM Spectrum Scale  file system AFM IW IBM Spectrum Scale  Cluster Cache site 2 IBM Spectrum Scale  file system AFM IW IBM Spectrum Scale Cluster Home  Site (NFS export) IBM Spectrum Scale  file system IBM Spectrum  Archive EE IBM Spectrum Scale  Cluster Cache site n IBM Spectrum Scale  file system AFM IW WAN NFS, CIFS, etc. NFS, CIFS, etc. NFS, CIFS, etc. Figure 9-5 Centralized Archive Repository Some examples of customers who can benefit from this solution are research groups that are  spread out geographically and rely on each group’s data, such as universities. Medical groups  and media companies can also benefit. Asynchronous Archive Replication is an extension to the stretched cluster configuration. In it,  users require the data created is replicated to a secondary site and can be migrated to tape at  both sites. By incorporating IBM Spectrum Scale AFM to the stretched cluster idea, there are  no limits on how far away the secondary site is located. In addition to geolocation capabilities,  data created on home or cache is asynchronously replicated to the other site.  Asynchronous Archive Replication requires two remote clusters configured, one being the  home cluster and the other being a cache cluster with the independent writer mode. By using  the independent writer mode in this configuration, users can create files at either site and the  data/metadata is asynchronously replicated to the other site.  9.2.2 Asynchronous Archive Replication 270  IBM Spectrum Archive Enterprise Edition V1.2.6: Installation and Configuration Guide