Figure 80 Split mirror - remote mirror
The remote mirror transfers data to a physically separate site where it can be backed up to locally available tapes. This allows the separation of production data from backup data, eliminating the risk of a fire or other disaster damaging both the production and the backup environment at the same time.
No network resources are required to sync the mirrors during a backup. Although data is not transferred through the network, Data Protector still needs the communication between the Cell Manager and its clients.
This solution allows you to centralize a backup service by mirroring the application data from several production sites (A and C in this case) to a central location or central disk array. In this way, your investment in a backup service (server and tape library) can be consolidated and combined with the high availability of a remote mirror configuration.
The remote site cannot be used as an automatic disaster recovery site during the time of the backup, as the link between the two sites is split for the duration of the backup (and both disks are out of sync). This means that in case of a site A failure, site B cannot take over automatically (as it normally would) for x hours (x being the time the data takes to stream to the tape). This problem applies to local mirroring as well. However, it is particularly important for the remote solution, as the concept of a
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