description IBM Metro Mirror Overview
IBM Metro Mirror provides continuous data synchronization between primary and secondary IBM DS8000 storage systems located in separate geographic locations. This synchronous replication solution ensures rapid disaster recovery by automatically replicating production workloads. It’s designed for organizations needing robust protection against regional outages and is particularly valuable for businesses relying on z/OS environments requiring minimal downtime.
help IBM Metro Mirror FAQ
What is the difference between IBM Metro Mirror and Global Mirror?
Metro Mirror performs synchronous replication, meaning each write to the primary site is confirmed only after it is also written to the secondary site, ensuring zero data loss but limiting distance. Global Mirror performs asynchronous replication, allowing greater geographic distances but with a small risk of data loss during a failure.
What IBM storage systems support Metro Mirror?
Metro Mirror is supported on IBM's DS8000 series enterprise storage systems and select IBM FlashSystem configurations. It requires appropriate replication licensing and a Fibre Channel or IP-based connection between the primary and secondary sites.
What is the practical maximum distance for IBM Metro Mirror?
Because Metro Mirror is synchronous, the practical distance is limited by round-trip latency, typically to roughly 100 to 300 kilometers between sites. Beyond that range, application write performance degrades noticeably due to the time it takes to confirm each write at the secondary location.
Does IBM Metro Mirror support replication over IP networks?
Yes, Metro Mirror can operate over Fibre Channel connections as well as over IP networks using FCIP (Fibre Channel over IP) protocol. This provides flexibility for data centers that need to use existing IP infrastructure rather than dedicated Fibre Channel links.
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