Albert wrote: ... > Thx for the answered, but the centos have commercial support like RHEL? CentOS itself is a volunteer non-commercial effort. If you want a paid-support OS RHEL is highly recommended, and CentOS would not exist without them. There are also companies that offer commercial support for CentOS - google "centos commercial support" and you will find some. One that I happen to know actively participates in CentOS is http://www.owlriver.com/support/centos/ Phil