Copy of replication status for synchronization

摘要

For synchronizing replication status, a copy module continuously replicates data from a first device designated with a device status of primary to a second device designated with a device status of secondary. A first peer-to-peer remote copy (PPRC) relationship is established between the first and second devices. The first and second devices store replication information comprising a bitmap with a replication status for each data block of the first device. The copy module further copies an instant point-in-time copy of the data from the second device to a copy device. In addition, the copy module copies the replication information from the second device to the copy device and links the replication information of the second device and copy devices.

主权项

1. An apparatus comprising:
a computer readable storage medium storing program code executable by a processor to: continuously replicate 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 devices; copy 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; create a link between the replication information of the second device and the replication information of the copy device; and in response to a failback command, designate the copy device with a device status of primary and the first device with the device status of secondary, and validate 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.