QReplica 3.0

Synchronous Replication

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Ensure Zero Data Loss in Disaster

Synchronous replication writes data to source unit and replicas at the same time, so the primary copy and the replica are always in sync. In the event of a disaster, synchronous replication can provide maximum protection and ensure zero data loss.

Synchronous replication Ensures Zero Data Loss in Disaster
Sync. Replication vs. Async. Replication

Synchronous replication is suitable for mission critical applications that require instant failover, but the system design is relatively complex. Asynchronous replication is suitable for a certain delay in copying the data from source unit to target. These two need to be chosen according to the actual situation.

Synchronous ReplicationSynchronous Replication
RPO= 0Last sync. of incremental data
RTO0 ~ Very lowTime of next sync
Delay between Source & Target< 10 msNo limit, preferably < 1 sec.
Distance between Source & Target100 kmNo limit
Host Performance ImpactMinorNo impact
ApplicationMission criticalBusiness critical
License RequiredYesNo
Sync. Replication + C2F Solution

In most cases, volume with Write-back capability has better performance than Write-through. The best practice of volume Write-back plus BBM (Battery Backup Module) solution can reduce the risk of dirty cache.

Synchronous Replication along with C2F Solution
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