[Lustre-discuss] NFS Export Issues

[schroete at iup.physik.uni-bremen.de]

Zitat von William Olson <lustre_admin at reachone.com>:

We had such a problem when first experimenting with a lustre reexport  
via nfs. In our case the "permission denied" was a problem that the  
"user(owner)" of the reexporting machine (directory) wasn't known on  
the mds.

Regards
Heiko


> On 7/16/2010 6:16 PM, Kevin Van Maren wrote:
>> But the client is doing a lstat on /mnt/lustre_mail_fs, not
>> /mnt/lustre -- what is the mount command again?
>>
>
> I think my server names are confusing the situation..
>
> Lustre client = NFS server
> Lustre is mounted in /mnt/lustre_mail_fs
> /mnt/lustre_mail_fs is exported with NFS
>
> NFS client is attempting to mount the /mnt/lustre_mail_fs export to it's
> /mnt/lustre directory..
>
> mountd(on the NFSserver/lustre client) fails to stat the correctly
> mounted and fully operational /mnt/lustre_mail_fs, during an NFS client
> connection attempt.
> The NFS client authenticates properly according to the logs, it's only
> when mountd attempts to stat the lustre fs that problems arise..
>
> Again, for clarity, I can successfully export and mount any other
> directory from this same machine, to the same client..
>
>> On Jul 16, 2010, at 6:50 PM, William Olson <lustre_admin at reachone.com>
>> wrote:
>>
>>> On 7/16/2010 5:41 PM, Kevin Van Maren wrote:
>>>> Looks like a problem with your mount point.  What are the
>>>> permissions on the client directory?
>>>>
>>> NFSServer/Lustre Client
>>>
>>> Lustre mounted:
>>> drwxrwxrwx 29 root root 4.0K Jul 12 17:03 lustre_mail_fs
>>> Lustre not mounted:
>>> drwxrwxrwx 2 root root 4.0K Jun 10 13:26 lustre_mail_fs
>>>
>>> NFSClient mount dir:
>>> drwxrwxrwx  2 root root 4.0K Jul 12 15:09 lustre
>>>
>>>>
>>>> On Jul 16, 2010, at 6:23 PM, William Olson
>>>> <lustre_admin at reachone.com> wrote:
>>>>
>>>>> On 7/16/2010 5:12 PM, Andreas Dilger wrote:
>>>>>>
>>>>>>> Well that improved the debug level, but didn't reveal any -2
>>>>>>> errors..   In fact I can't seem to find a line with an error in
>>>>>>> it... Is there a specific verbiage used on error lines that I can
>>>>>>> grep for?  90% is "Process entered" or "Process leaving"...
>>>>>>>
>>>>>> You could try "strace -f" on the mount process, to see which
>>>>>> syscall is failing.  It may be failing with something before it
>>>>>> gets to Lustre.
>>>>>>
>>>>> Results of strace below:
>>>>>
>>>>> [root at lustreclient mnt]# strace -f -p 15964
>>>>> Process 15964 attached - interrupt to quit
>>>>
>>>>
>>>>
>>>>> lstat("/mnt", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
>>>>> lstat("/mnt/lustre_mail_fs", 0x7fff4bd4b2b0) = -1 EACCES
>>>>> (Permission denied)
>>>>> stat("/etc/localtime", {st_mode=S_IFREG|0644, st_size=2875, ...}) = 0
>>>>
>>>>
>>>
>
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