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| What is fast failover | ||
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Fast failover is a new feature that improves the failover time for the storage stack configured in a clustered environment. Fast failover includes several design changes and enhancements to the core SFW components. These changes provide significant reduction in the failover time taken by storage resources during service group failovers.
The following factors determine how fast SFW fails over the storage stack:
Fault detection
How fast the clustering software detects a fault
Fault notification
How fast SFW is able to get the fault notification
Storage management and remedial actions
How SFW manages configuration changes and the actions it takes on the storage
With fast failover, SFW addresses Fault notification and Storage management and remedial actions factors. SFW has optimized the algorithms and enhanced the internal logic used to manage disk groups and the storage configuration changes across the nodes in a cluster.
Cluster Server (VCS) addresses the Fault detection factor with the Intelligent Monitoring Framework (IMF) feature that provides instantaneous fault detection capability.
Fast failover integrates with the IMF feature to provide a significant performance improvement in SFW HA cluster environments.