IBM Storage
IBM Global Mirror
Asynchronous data replication over long distances. Enterprise-class business continuity and disaster recovery.
How does Global Mirror work?
Asynchronous replication with minimal delay over unlimited distances.
01
Local write
Data written to primary site
02
Buffering
Changes queued for replication
03
Transfer
Asynchronous transfer to DR site
04
Confirmation
Data consistency verification
Global Mirror vs Metro Mirror
Global Mirror
- Asynchronous replication
- Unlimited distance
- RPO: seconds to minutes
- Minimal performance impact
- Ideal for geographic DR
Metro Mirror
- Synchronous replication
- Up to 300 km distance
- RPO: zero (0)
- Higher bandwidth requirements
- Ideal for metropolitan DR
Business benefits
- Protection against natural disasters and regional outages
- Critical systems business continuity
- Regulatory compliance (NIS2, DORA)
- Flexible RPO/RTO tailored to needs
- Automatic failover and failback
- Integration with FlashSystem and SVC
Technical specifications
Replication type Asynchronous
Maximum distance Unlimited
RPO Seconds - minutes
Protocols FC, iSCSI, IP
Compatibility FlashSystem, SVC, DS8000
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