If your network is heavily loaded you may see some problem withCommon Internet File System (CIFS) and NFS under Linux. By defaultLinux CIFS mount command will try to cache files open by the client. You can use mount option forcedirectio when mounting the CIFS filesystem to disable caching on the CIFS client. This is tested with NETAPP and other storage devices and Novell, CentOS, UNIX and Red Hat Linux systems. This is the only way to avoid data mis-compare and problems.
The default is to attempt to cache ie try to request oplock on files opened by the client (forcedirectio is off). Foredirectio also can indirectly alter the network read and write size, since i/o will nowmatch what was requested by the application, as readahead and writebehind is not being performed by the page cache when forcedirectio is enabled for a mount
mount -t cifs //mystorage/data2 -o username=vivek,password=Refer mount.cifs man page, docs stored at Documentation/filesystems/
