[CentOS] New to VM

>For example if i have 2 ibm Eserver 326 with dual xeon 2.8ghz each with 2 sata 200Gb drives. 

Not much if there's any IO at all, those sata drives will not
do much for performance. I have a variety here of sata and SAS
and even on good controllers, the sata drives obviously just
don't handle much.