Today, I’ve upgraded total 8 servers from 4GiB to 8GiB to improve performance of system by inserting additional memory modules. We started each server and checked for memory count at console. All severs booted normally after the upgrade and services such as SMTP, NFS, CIFS, HTTP started as expected. Shortly, afterwords I got a call from help desk about pop3 server for slow performance.
If your network is heavily loaded you may see some problem with Common Internet File System (CIFS) and NFS under Linux. By default Linux 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.
How do I access networked file system mounts such nfs via ftp servers under Linux / UNIX?
Finally, someone spends time to work with a Linux server and OS X authentication issue:
OSX has what I would call an undocumented feature of the operating system- the portable home directory. Basically, it keeps a user’s home directory sync’d up between a network share and the local pc. If you are not on the network you work on the local home directory. Whenever you login on the network, the mirror agent running on the local pc synchronizes the two directories.
Full Stack: Portable Home Directory over NFS on OSX authenticated via OpenLDAP on Debian Linux