If many of us have heard of virtualization few have had the opportunity to implement a huge production on this platform. The most common platform for virtualization known by each of us is vmware for sure, but I assure you that with virtualization embedded in future releases of RHEL 5 and RHEV, Oracle would gain in power because REDHAT is a native OS platform for Oracle.
As an Oracle database administrator I have implemented some test environment with Oracle 10g on vmware and REDHAT but was still doubtfull if a huge production environment would not suffer i/o because we mainly use Oracle and knowing that Oracle flushish the data directly on hard disk once the buffer is 1/3 full or some different conditions u probably know. The logical question I had to ask myself was if Oracle wouldn't suffer if some other process should first manipulate this data before writing them on disk.
I had this exchange with the boss of VLP M. Alex SANTON who gave me some explanation on the issue. For sure we may have a low waste of time but this is definitely insignificant if we take into consideration the load balancing we are benefiting from a virtual layer wish permit a better management of the memory and processing capacities.
I would later give you a lesson on SQL tuning because this is a very important issue on I/O and many database administrator take for granted that once sql retrieve a result they are expecting then everything is OK. That is wrong and totally wrong
VLP is partner with
OPENBRAVO which i know and does more on ERP and CRM
You may have a look on their web site: www.vlpopensource.com