Optimized I/O Access Policies
By working with UltraPath, HyperMetro provides two I/O access policies based on the distance between the active-active sites.
- Load balancing mode
- Local preferred mode
Load Balancing Mode
This mode is mainly used when HyperMetro storage systems are deployed in the same DC. In this scenario, both storage systems deliver almost the same access performance to a host. To maximize resource usage, host I/Os are evenly distributed to both storage systems.
Local Preferred Mode
This mode is mainly used when HyperMetro storage systems are deployed in different DCs. In this scenario, the two DCs may be far away from each other, and the round-trip time is longer than in a single DC. In this mode, you can assign a preferred storage system on UltraPath. Host I/Os are delivered only to the preferred storage system. This avoids I/O access across storage systems. I/Os are delivered to the non-preferred storage system only when the preferred storage system is faulty.