Multi-site mirroring
Multi-site mirroring is an IBM® XIV® Storage System technology that allows customers to set High Availability and Disaster Recovery solutions over multiple sites, keeping 3 copies of their data.
Key features of multi-site mirroring are:
- Concurrent multiple multi-site mirroring
- The IBM XIV approach to multi-site mirroring includes 3 peers with one synchronous and two asynchronous replications among them (one of them at standby).
- Multiple multi-site mirroring configurations run concurrently per system, each with separate mirror peers.
- The source runs 2 concurrent mirrors into 2 different destinations
- Any given system can be represented in several multi-site configurations, each referencing different systems.
- A system can host mirroring peers with different roles in different multi-site configurations.
- Extensibility
- Any existing two-way mirroring relation (synchronous or asynchronous)
can be extended to three-way mirroring, with no need to disrupt the
existing mirror relation.Note: Three-way mirroring cannot be configured on a mirrored consistency group, but can be configured on a local consistency group.
- The multi-site mirroring relation is created based on an already existing target connectivity.
- Any existing two-way mirroring relation (synchronous or asynchronous)
can be extended to three-way mirroring, with no need to disrupt the
existing mirror relation.
- Maintainability
- If one mirror of the multi-site mirror fails, the other mirror continues.