Selective write protect for disaster recovery
The selective write protect function that is configured through the Write Protect Mode panel on the TS7700 Management Interface creates categories that are excluded from write protection on a cluster. You can use this function to test disaster recovery (DR) preparedness.
You can use selective write protect during a DR test when a recovery host that is connected to a non-production cluster must access and validate production data without any risk of modifying it.
When Write Protect Mode is enabled on a cluster, host commands fail if they are issued to virtual devices in that cluster and attempt to modify a volume's data or attributes. Meanwhile, host commands that are issued to virtual devices in peer clusters are allowed to continue with full read and write access to all volumes in the library. A cluster can be placed into Write Protect Mode only if the cluster is online. When set, the mode is retained through intentional and unintentional outages and can be disabled only through the same management interface panel that is used to enable the function. When a cluster within a grid configuration has Write Protect Mode enabled, standard grid functions such as virtual volume replication and virtual volume ownership transfer are unaffected.