allows up to three replicas, and each can have an additional two copies if cascading is used.
During the instant recovery, the data on the specified replica (left unchanged for the purpose of instant recovery) is synchronized to the application client source volumes without restoring from a backup medium.
Data Protector will only use the first three replicas because secondary mirrors cannot perform
ZDB to tape and ZDB to disk+tape
During
•discarded - ZDB to tape
•retained and can be used for instant recovery - ZDB to disk+tape
ZDB to disk
During a
Replica set rotation
Several replicas can exist at the same time. HP StorageWorks Disk Array XP allows up to three replicas, and each can have an additional two copies if cascading is used. Data Protector can use only disks from the first three replicas (first level mirrors or MUs) for backup and instant recovery purposes. The additional six copies (cascading mirrors) are not supported.When configuring a ZDB backup specification for a source volume (LDEV) with first level mirrors configured or when restoring to such a source volume, it is, using Data Protector, possible to define a replica set from which this integration selects one replica for the current session.
Backup clients and clusters
The backup client should not be used as a failover server for the application client. It is recommended to have application and backup services on separate clusters.
268 | Split mirror concepts |