Following error is seen when adding a NAS iDA NetApp 7-mode client in the CommCell v10.
Customer reported : Telnet to Port 10000 on the NAS Host works.
Telnet to Port 10000 is a good troubleshooting step, however in cases like this, it isn't helpful.
Reason : Telnet to Port '10000' only signifies NDMP server is listening, but we need to find out why is it refusing to speak, and reporting this error - 'Please verify NDMP server is running on that host'.
Cause: NDMP server [FILER] is definitely listening on Port 10000, but it is refusing connection requests, b'cos its NDMP memory pool is Full.
Initial troubleshooting steps:
Ensure NDMP is turned on.
FILER>options ndmpd.enable
ndmpd.enable on
That indicates, NDMP server is definitely listening, however there is something which is preventing the communication.
First clue, as reported in EvMgrS.log: Connection refused by the NDMP server
This is the first clue, which kind of give us an indication that the NDMP server is unable to accept any more connections.
Second clue, look for stale NDMP sessions on the filer:
FILER>backup status
This will tell you if there is any existing NDMP backups running on the filer. In this case, there were none.
FILER>ndmpd status
In this particular case, we found there were lot of stale NDMP sessions sitting idle and doing nothing, in other words, they were simply holding on to NDMP memory and hence stopping NDMP to accept new connection.
Please note, If there is nothing in the backup status output, then you can safely kill all the stale ndmp sessions that are shown via ndmpd status output.
Solution:
1. Kill all the stale sessions.
FILER>ndmpd killall
2. Turn off and turn On NDMP [This step may be required, but not necessary]
FILER>options ndmpd.enable off
FILER>options ndmpd.enable on
3. Try to add the NDMP NAS iDA client once again, this time it should succeed.
Please Note: For more information on available ndmpd commands, simply type 'ndmpd' on the putty console for 7-mode;
FILER> ndmpd
usage: ndmpd [on|off|status|probe [<session #>]|kill <session #>|killall|
Customer reported : Telnet to Port 10000 on the NAS Host works.
Telnet to Port 10000 is a good troubleshooting step, however in cases like this, it isn't helpful.
Reason : Telnet to Port '10000' only signifies NDMP server is listening, but we need to find out why is it refusing to speak, and reporting this error - 'Please verify NDMP server is running on that host'.
Cause: NDMP server [FILER] is definitely listening on Port 10000, but it is refusing connection requests, b'cos its NDMP memory pool is Full.
Initial troubleshooting steps:
Ensure NDMP is turned on.
FILER>options ndmpd.enable
ndmpd.enable on
That indicates, NDMP server is definitely listening, however there is something which is preventing the communication.
First clue, as reported in EvMgrS.log: Connection refused by the NDMP server
This is the first clue, which kind of give us an indication that the NDMP server is unable to accept any more connections.
Second clue, look for stale NDMP sessions on the filer:
FILER>backup status
This will tell you if there is any existing NDMP backups running on the filer. In this case, there were none.
FILER>ndmpd status
In this particular case, we found there were lot of stale NDMP sessions sitting idle and doing nothing, in other words, they were simply holding on to NDMP memory and hence stopping NDMP to accept new connection.
Please note, If there is nothing in the backup status output, then you can safely kill all the stale ndmp sessions that are shown via ndmpd status output.
Solution:
1. Kill all the stale sessions.
FILER>ndmpd killall
2. Turn off and turn On NDMP [This step may be required, but not necessary]
FILER>options ndmpd.enable off
FILER>options ndmpd.enable on
3. Try to add the NDMP NAS iDA client once again, this time it should succeed.
Please Note: For more information on available ndmpd commands, simply type 'ndmpd' on the putty console for 7-mode;
FILER> ndmpd
usage: ndmpd [on|off|status|probe [<session #>]|kill <session #>|killall|
