Lexmark X925 Lexmark Document Distributor - Page 30
Using multiple systems for high availability
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Installing Lexmark Document Distributor 30 Configuration Description Advantages X‑Y‑N Database (DB) on X computers in a Microsoft Cluster Server for High failover, load balancer (LB) on Y other computers in a Microsoft Cluster availability, Server for failover, server on one or more additional computers further improved LB performance (cluster) Server(s) Disadvantages Further increased hardware needs, cluster licensing DB (cluster) Note: An external Oracle database may be installed in place of the standard database, resulting in an E-Y-N configuration. The external database (E) on X computers and the load balancer (LB) on Y other computers in a Microsoft Cluster Server for failover. The server is on one or more additional computers. Using multiple systems for high availability When configuring multiple LDD systems, you can connect them to a hardware load balancer or Global Site Selector (GSS) to provide high availability, without using clustering, as well as increased capacity. Hardware load balancer A1 Load balancers/ databases A2 A3 Servers T1 T2 T3 T4 T5 T6 Configuration 1-N LDD system Configuration 1-N LDD system Configuration 1-N LDD system Each system group contains two identical LDD systems. Jobs are balanced between these systems in each group by the hardware load balancer or GSS. If a failure occurs in one system in a group, then the other system in the group receives all incoming jobs until the failed system can be restored.