Journal-based replication without journal loss
AssigneeEMC International Company
InventorsAssaf Natanzon, Saar Cohen, Efri Nattel-Shay
Life of this patent
Estimating the term…
Abstract
In one aspect, a method includes performing a failover in a journal-based replication system and performing a failback in the journal-based replication system without loss to journaling. In another aspect, an article includes a non-transitory machine-readable medium that stores executable instructions. The instructions cause a machine to perform a failover in a journal-based replication system and perform a failback in the journal-based replication system without loss to journaling. In a further aspect, an apparatus includes circuitry configured to perform a failover in a journal-based replication system and perform a failback in the journal-based replication system without loss to journaling.
Claims19
A method comprising:
- performing a failover in a journal-based replication system comprising:
- rolling back to a point-in-time;
- ceasing replicating a production logical unit;
- and
- generating a snapshot of a backup logical unit
- adding metadata, from a DO METADATA stream of a backup site journal to a delta marking stream of the snapshot;
- replicating the snapshot to the backup logical unit and the production logical unit;
- and
- allowing access to the snapshot;
- and
- performing a failback in the journal-based replication system without loss to journaling.
An article comprising:
- a non-transitory machine-readable medium that stores executable instructions, the instructions causing a machine to
- perform a failover in a journal-based replication system comprising:
- roll back to a point-in-time;
- cease replicating a production logical unit;
- and
- generate a snapshot of a backup logical unit
- add metadata, from a DO METADATA stream of a backup site journal to a delta marking stream of the snapshot;
- replicate the snapshot to the backup logical unit and the production logical unit;
- and
- allow access to the snapshot;
- and
- perform a failback in the journal-based replication system without loss to journaling.
An apparatus, comprising:
- circuitry configured to:
- perform a failover in a journal-based replication system comprising:
- roll back to a point-in-time;
- cease replicating a production logical unit;
- generate a snapshot of a backup logical unit;
- add metadata, from a DO METADATA stream of a backup site journal to a delta marking stream of the snapshot;
- replicate the snapshot to the backup logical unit and the production logical unit;
- and
- allow access to the snapshot;
- and
- perform a failback in the journal-based replication system without loss to journaling.
Dependencies are inferred from the claim text.