My customer has a failsafe cluster installed, what are the benefits of moving their system to RAC?
Fail Safe development is continuing. Most work on the product will be around accomodating changes in the supported resources (new releases of RDBMS, AS, etc.) and the underlying Microsoft Cluster Services and Windows operating system. A failsafe protected instance is an Active/Passive instance so, as such, does not benefit that much at all from adding more nodes to a cluster. Microsoft have a limit of nodes in a MSCS cluster. (typically 8 nodes – but it does vary). RAC is active active so you get dual benefits of increased scalability and availability every time you add a node to a cluster. We have a limit of 100 nodes in a RAC cluster (we don’t use MSCS). Your customer should really consider more than 2 nodes. (because of aggregate computer power on node failure). If the choice is 2 of 4 CPU nodes or 4 of 2CPU node then I would go for 2 CPU nodes. Customers are using both Windows Itanium RAC and Windows X64 RAC. Windows X64 seems more popular. Keep in mind, though, that for Fail Safe,
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