[Lustre-discuss] Problems using Lustre and NFS

[Dilling]

Hi,
we observe a problem exporting a lustre directory over nfs version 3.  
MDS and OSTs are running the lustre kernel:
2.6.16-27-0.9_lustre-1.4.11smp on SLES 10 systems. All lustre clients  
are using:
2.6.18-8.1.8.el5_lustre.1.6.2smp.
 From one of these clients we try to export a directory and have the  
following entry in /etc/exports:
/lustre/home/zrsdw01 ip_address(rw,no_root_squash,async)
The mounting hosts are running RHEL4 or SuSE 10.1. We have the stanza:
name of exporting host:/lustre/home/zrsdw01  /zrsdw01 nfs bg,intr      0 0
The behavior is unchanged if we add the async option or not. We are  
using 64bit Systems only.
Exporting, mounting and reading from the freshly mounted dir work fine.
Writing to existing files seems to work without any errors. But  
closing a vi session resulted in the message:
fsync.tst" E667: Fsync failed
We wrote a small program to get more insight to this problem. To  
summarize the result:
Overwriting an existing file works. Using open(...,O_CREAT,...) works,  
writing 4Bytes succeeds, close and fsync fail. If we use the sequence  
fsync, close we get a permission denied from fsync but not from close,  
if we use close only we get the permission denied from the call to  
close. (The reported errno was 13) Do you have any idea what is going  
wrong. What additional information do you need to send us a hint how  
we can resolve the problem. Are there incompatibilities between the  
different software components?
thanks
w.dilling

--------------------------------------------------------------------------------
W.Dilling                               Tel.: (49) 7071/29-70206
Universitaet Tuebingen                  Fax.: (49) 7071/29-5912
Zentrum fuer Datenverarbeitung          mail: dilling at zdv.uni-tuebingen.de
Waechterstrasse 76
72074 Tuebingen

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