[Centos] software Raid1 on centos3

how is the stability of software raid1 on a system running centos3.

i have 2 75gig hard drives that i would like to mirror if possible,
that being the reliability is worth it...there will be lots of network
traffic on the server. It will be used possibly as a file server,
it will most definitely be used also as a mail server and webserver.

i would be ok to me to not mirror the drives but this is for my place
of employment and im looking to implement a linux server. im not new
to linux, just the whole raid situtation. i would like to show my 
employer how well linux runs in a business environment.

Thanks