Adaptec 412R User Guide - Page 129
How Available are Clusters?, Application of Availability, Table A-7
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Theory of Controller Operation I allows for the nodes to be geographically located? How Available are Clusters? Table A-7 outlines the maximum availability per downtime in the different architectures: Table A-7 Maximum Availability Per Downtime Architecture Continuous Processing Fault-Tolerant Clusters High Availability Stand Alone System Maximum Availability 100.00% 99.9999% 99.9 - 99.999% 99.9% 99.5% Downtime per Failure None Cycles Seconds to minutes Minutes Hours Downtime per Year (in minutes) 0 0.5 - 5 5 - 500 500 - 10,000 (disk mirroring) 2,600 - 10, 000 (without disk mirroring) Application of Availability The DuraStor storage subsystem implementation of availability within its supported topologies are shown in Table A-8. Table A-8 Implementation in Topologies Architecture Continuous Processing Fault-Tolerant Cluster High Availability Stand Alone System Corresponding Topology Not Available Active-Passive Dual-Port Active-Active Dual-Port Active-Active Single-Port Stand-Alone Dual-Port A-27