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SAN Management

Replication and Mirroring

Replication is critical for off-site data protection, business continuity and disaster recovery. Replication transmits block-level data over an IP network. StarWind can perform both synchronous mirroring and asynchronous replication. Asynchronous replication is ideal for getting data off site when replicating over a WAN or the internet. Asynchronous replication in StarWind can be performed on snapshots to reduce the overhead to application servers, or on primary data LUNs for situations when disk I/O degradation is not an issue.

Synchronous Mirroring is a technology designed for replicating between storage nodes in the same datacenter where redundancy of nodes is needed and low latency IP connection is required. It is widely used in datacenters to ensure that only one rack falls in case of power or cooling problems and others continue working. Spreading StarWind SAN’s onto two or more racks by means of synchronous mirroring permits zero data loss in the event that one of your racks goes down.

Asynchronous Replication

• Perform Real-time data off site replication for Disaster Continuity and Fail-Safe data Protection

Synchronous Mirroring

• Mirrors two independent storage nodes for High Availability of data and SAN redundancy
• Eliminates single points of failure
• Reduces downtime while protecting your mission critical data

More on Synchronous Mirroring vs Asynchronous Replication:

With synchronous mirroring, each write operation requires control confirmation from both storage nodes. This approach guarantees reliability of data transfers but is demanding in bandwidth (insomuch that mirroring will not work on higher latency networks). With asynchronous replication, confirmation from each storage node is not required. Asynchronous replication does not guarantee data integrity in the event of storage or network failure; hence, some data loss may occur what makes asynchronous replication a better fit for backups and disaster recovery where some data loss is acceptable. For zero data loss use StarWind’s CDP replication. CDP utilizes more overhead on the SAN that Asynchronous replication and is better for servers like database and email where zero data loss is preferred, but less critical servers yet can be replicated asynchronously.