You can use the below commands to find incomplete,inactive and in-progress replications status.On 7.6.0.4 we execute the below commands on source server.nbstlutil stlilist -image_incompletenbstlutil stlilist -image_inactive -Unbstlutil report;dateI a...
You may also want to look the value set for the parameter "Max Size per AIR replication job"This number decides the number of replication jobs to trigger for your backup.By lowering this number you can concurrently run more number of replication job...
Check your TCP keep alive and DSP_Proxy timeouts on Data domains,if not already done.When we had similar issues,we were told that these 2 timeouts were key reasons for these errors.Check if this helps