Yesterday we had a chat about performance and restorability and I realized how many good things a virtualisation environment can bring to me - but as I'm a little sceptic concerning performance I'm asking here
Will a database server suffer from severe performance loss through virtualisation? I don't understand the technology to the last detail, but somehow it's a 'blackbox' more that needs to be processed through hardware. Also will disk access, with all the tricks postgis gives to us be granted (clustering, index etc.) - fragmented clustering is like no clustering!
The big advantage is maintenance and scalability. In case of a severe hardware malfunction I can migration within minutes or even realtime to another physical machine.
Who has experience and can point me to good websites or literature on this topic. I remember a few things from the last FOSSGIS and a few inhouse benchmarks on ESXi and native Servers and somehow I can't make up my mind whether it's good or not.