Quantum Universal Remote 3.1.3 User Manual

StorNext User’s Guide

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shuts down a degraded MDC and then reboots it so that, on recovery, it 

becomes the standby MDC in the event future MDC failover is required.
While other methods of failover are available, such as quorums, 

STONITH is the only widely acknowledged method of reliable failover 

control - especially for software that runs on multiple operating systems. 

Without STONITH, there is the possibility that a damaged MDC could 

continue acting as the primary MDC and attempt to handle client IO 

requests or move data between storage tiers. For shared file systems 

STONITH is especially critical because a MDC controls access for 

multiple hosts reading and writing to a single volume - and potentially 

the same file.
Currently MDC failover is only supported when configured by Quantum 

Solutions Engineering staff.