Hi, thanks for your answer. In fact, now Im testing OpenERP v7 and Im testing too a VPS service of 1and1 provider... Yes, I know there are providers better than 1and1 (hostgator, bluehost, etc), but it's only a test, and Im not sure about this service, I have some problems with 1and1 in the last months, connectivity problems. I have another 15 sites in 1and1 and Im looking for other providers. In the future, I would like have another provider for my sites, I think is not good idea have all sites in one provider...
About installation of OpenERP, I have installed OpenERP five times for now in the last week, in CentOS and Ubuntu (VPS and Virtual Machine under Parallels, in local) and works fine, but sometimes appears a mistake and I guess it's because I have not yet managed to make a good setup with the configuration correct parameters, but it is close.
Prometheus did not know, but it seems very interesting, I see that uses SSD HD, that should be a significant increase in speed. Perhaps try. Prometeus page have a problem, now there is not stock for OpenVZ VZSSD7 VPS.
Thanks again
Mc