During network diagnosis I found that there are no errors in "ifstat -a" output but there are some issues with in the physical and transport layers in "netdiag -v" in our both filers. Below are the output of that:
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Performing physical layer diagnostics.....
The interface e4a seems to be receiving an excessive number of packets for protocols not supported this system.
If this problem persists, please contact your network administrator.
The interface e4b seems to be receiving an excessive number of packets for protocols not supported this system.
If this problem persists, please contact your network administrator.
Performing network layer diagnostics.....OK
Performing transport layer diagnostics.....
The TCP receive window advertised by NFS client xxxxxx is 6912.
This is less than the recommended value of 8760 bytes. You should increase the TCP receive buffer size for NFS on the client.
Average size of CIFS TCP packets received from host: xxxxxx is 223.
This is less than the MTU (1500 bytes) of the interface involved in the data transfer.
The maximum segment size being used by TCP for this host is: 1460. Low average size of packets received by this system might be because of a misconfigured client system, or a poorly written
client application.
There are more than 100 messages like this from both filers. (I have cluster of two 3140 nodes)
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I have few queries on above issues:
- How to check the physical layer problems which is marked by red color?
- The transport layers shows the wrong buffer size from both unix and windows and that count of unix and windows is 100:10. Does the fixing of right buffer size in windows client improve the performance of that client or whole filer?
If there is any document on that to read about, it will be helpful.