how to enable NFS trace
We have RHEL 5.10. From DB server a partition is exported via NFS to 3 NFS client server (SAP)
Very often SAP application shows errors that NFS server not reachable or its hung. But in NFS client/server, in messages logs, there is no such errors. Not sure how SAP application alone reports the errors, but am not able to see them in NFS server or client side.. tcpdump o/p 07:42:02.549679 IP server01.nfs > server02.773845761: reply ok 1368 read 07:42:02.549698 IP server01.nfs > server02.538976288: reply ERR 1368 07:42:02.549705 IP server02 > server01.nfs: . ack 266209 win 7626 <nop,nop,timestamp 1933690912 2111305698> 07:42:02.549766 IP server01.nfs > server02.538976288: reply ERR 1368 07:42:02.549772 IP server01.nfs > server02.1952804468: reply ERR 1368 07:42:02.549775 IP server02 > server01.nfs: . ack 268945 win 7626 <nop,nop,timestamp 1933690912 2111305698> 07:42:02.549804 IP server01.nfs > server02.1626262330: reply ERR 1368 07:42:02.549850 IP server01.nfs > server02.825761840: reply ERR 1368 07:42:02.549854 IP server02 > server01.nfs: . ack 271681 win 7626 <nop,nop,timestamp 1933690912 2111305698> 07:42:02.549871 IP server01.nfs > server02.1462452580: reply ERR 1368 07:42:02.549896 IP server01.nfs > server02.72831084: reply ERR 1368 07:42:02.549899 IP server02 > server01.nfs: . ack 274417 win 7626 <nop,nop,timestamp 1933690912 2111305698> 07:42:02.549983 IP server01.nfs > server02.4286075787: reply ERR 1368 07:42:02.550683 IP server01.nfs > server02.732516835: reply ERR 1368 07:42:02.550696 IP server02 > server01.nfs: . ack 277153 win 7626 <nop,nop,timestamp 1933690912 2111305698> 07:42:02.550758 IP server01.nfs > server02.3400406261: reply ERR 1368 07:42:02.550774 IP server01.nfs > server02.780585953: reply ERR 1368 07:42:02.550778 IP server02 > server01.nfs: . ack 279889 win 7626 <nop,nop,timestamp 1933690912 2111305699> 07:42:02.550800 IP server01.nfs > server02.2761732424: reply ERR 100 07:42:02.559450 IP server02.790622977 > server01.nfs: 132 read fh Unknown/01000 In some forum, they say its related to network. Is it possible to enable trace for NFS client partitions.. |
Quote:
Your best bet is to call the SAP Application vendor and/or Red Hat support...since you're PAYING FOR RHEL, right??? They can help you run a very detailed trace and analysis of things, and help you diagnose the problem. Have you applied the latest patches to RHEL 5.10's NFS?? |
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