| 主权项 |
1. An apparatus comprising:
a computer readable storage medium storing program code executable by a processor, the program code comprising: a copy module continuously replicating data from a first device designated with a device status of primary to a second device designated with a device status of secondary, wherein a first peer-to-peer remote copy (PPRC) relationship is established between the first and second devices, the first and second devices storing replication information comprising a bitmap with a replication status for each data block of the first device, copying an instant point-in-time copy of the data from the second device to a copy device, copying the replication information from the second device to the copy device, and creating a link between the replication information of the second device and the replication information of the copy device; and a validation module, in response to a failback command designating the copy device with a device status of primary and the first device with the device status of secondary, validating a new PPRC relationship by comparing the PPRC relationship replication status stored on the second device with the PPRC relationship replication status stored on the first device. |
