Backups getting failed with "Unable to close save session: Save session with saveset id xxxxx terminated

@PRASAD R,

Can you in more details? Like -

What is the backup of?

How long has it been running?

Is it a partial Failure or complete client failure?

Is there a firewall between the client and the server?

Can you in more details? Like -

What is the backup of? - its a file-system backup 

How long has it been running?- runs for usually 10-15 mins and fails with below error 

Is it a partial Failure or complete client failure?- yes its a partial failure , some clients do succeed , and sometimes when we re-trigger these failed Clients it gets succeeded .Also when we completed stop/start the networker services , we see these is a getting backed up .

Is there a firewall between the client and the server?

No,  runs on a backup VLAN .

It looks as if this points towards a connectivity issue. Why? - because there is no feedback any more.

NW usually controls everything hut he can't if there is a network problem. Assuming that, it is most likely that you will already see that when you run a manual backup.

So I want you to execute a standard "save -s nw_server large_file" at the client (bigasm) and verify the issue.

If it persists I would add debug information to the process like "save -D5 -s nw_server large_file > outfile" and check from here.

@bingo.1 

Thanks for your response , but looking at the error now some are getting timed out .

this is really bizarre behaviour we are facing .

when i run a probe - nsradmin -s clinet_name -p nsrexecd , everything looks fine and after that when i re-run the backup , the failed clients are successful again . 

considering the behaviour , i feel this is a TCP timeout  and connectivity issue as you said .

PS: we are seeing this behaviour after we deployed / migrated backups to DD9800 with 6.1 DDOS .

not really really sure if this is a DD issue .

We have had multiple/various DDs over the years - with no such problems.

However, I vaguely remember 'similar' issues some years ago before we used DD boost devices.