Bidirectional replication lets you mirror the disk storage changes between a primary and a secondary appliance. This feature is available in many appliances. You can also emulate a bidirectional replication using two pairs of unidirectional replication appliances. Depending on the storage vendor, each appliance can take on the role of primary for some files and secondary for others.
CA Cloud Storage for System z (CS4z) can take advantage of bidirectional replication for disaster recovery purposes. Appliances that support bidirectional replication typically allow the NFS exports at the secondary site to be mounted read-only by other Linux systems. You can use this capability to read Virtual Volumes that are created at either site.
The topics in this section provide an example that demonstrates how you can configure CS4z to exploit bidirectional replication for disaster recovery.
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