Geographic mirroring is an independent ASP solution in which the IBM i operating system replicates data from independent ASPs at the memory page level (Figure 4). The independent ASP copy on the backup node is available for use after a detach operation stops its participation in the replication process. Geographic mirroring supports integrated environments (AIX, Linux, Windows).
Synchronous operation with a 10 mile maximum distance is recommended. Because a failure could result in data loss for heavily used objects, journaling is also recommended.
In environments which implement geographic mirroring, Assure MIMIX for PowerHA provides additional monitoring for and notification of conditions that may require action in order to prevent a prolonged switch. Geographic mirroring support combined with logical replication software from Precisely provides enhanced high availability and disaster recovery.
Figure 4.Geographic mirroring
