We're experiencing problems with some legacy software when it comes to NFS access. Even though files are visible in a terminal and can be accessed with standard shell tools and vi, this software typically complains that the files are empty or not syntactically correct. The NFS filesystems in question are 8TB+ XFS filesystems mounted with "delaylog,inode64,logbsize=32k,logdev=/dev/sda2,nobarrier,quota" options, and I suspect that inode64 may have to do with the observed behaviour. The server is running CentOS 6.3 + all patches. The clients exhibiting the problem are running CentOS 5.4 and CentOS 5.8 x84_64. Interesting enough, the application (which is available in 32-bit only) appears to work fine on RHEL3 32-bit; we have no CentOS5 32-bit systems to test. I was wondering if anyone has seen such behaviour and whether it can be corrected using nfs mount options. The only other solution I have at the moment is reformatting to ext4, i.e. ugly.