Hi CLARIION,  As a general rule, you can always sync up from an older version of OneFS to a newer version.  In your case, going from 6.5.5.X to 7.1.1.2 you can sync data in both directions, but advanced features like automated failover and failback will not work across the versions.  Cheers,Matt 
Hi guys,  I have to cluster replicated with SyncIQ. Both ones are running 6.5.5.x version.   My question is:         If I upgrade one of them to 7.1.1.2, is there any problem with replicas?  Thanks in advance,
SyncIQ between clusters with different OneFS version