[CentOS] CentOS 6 NFS mmap I/O bug?

Patrick Lists centos-list at puzzled.xs4all.nl
Mon Oct 22 18:15:44 EDT 2012


On 10/22/2012 11:31 PM, Tom McDonald wrote:
> I'm working with a company who is running into an issue occasionally
> with their app running CentOS 6 on an NFS mount.  The problem is
> essentially that, from a single CentOS 6 client, the client sometimes
> gets the wrong file size back from a stat() call.

Just a thought: could this be related to 32bit clients accessing a 64bit 
NFS server? Recently there was some discussion about this on the list. 
Iirc the solution was to use 32bit inodes on the NFS server. Search the 
list for "Mount options for NFS" posted on Oct 9. Here's a comment by 
James Person:

"I would suspect the inode64 option is the problem. We had similar 
issues running 32 bit apps on a 64 bit clients accessing 'large' NFS 
servers (non-Linux NFS servers) - the 'fix' was to make sure the file 
systems were exported/mounted with 32 bit inode compatibility. I believe 
in our case the 32 bit apps in question were not compiled with large 
file support (they are/were 3rd party apps). I think if they were 
compiled with large file support, then they would work OK."

Regards,
Patrick



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