[CentOS-virt] performance differences between kvm/xen

[compdoc]

I think he's right. Run PostgreSQL on the centos host directly, rather than
from within a guest. The vm guests could access the database over the
virtual lan, so speed of access for guests on the same server wouldn't be an
issue.

There are lots of ways of file sharing for example. You can share from
within a linux or windows guest, or you could share directly from the centos
host with samba or iSCSI.

I get native speeds from guests, but I think running directly from the
server is always going to be faster.