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Regarding PolyServe - it's a clustered file system with good HA but scale requires moving the SQL Server instance to another server in the pool - so in reality it's not scaling out as much as up.
Disk I/O is definitely a huge constraint on improving database performance - while GRIDSCALE does maintain multiple identical & consistent databases ...
I appreciate all the comments on Kevin’s blog regarding xkoto and GRIDSCALE. As a disclaimer, I work at xkoto, but I’m not wearing a marketing hat, I’m the strategy guy – in fact I may have met some of you at PASS 2007 or 2008. While we often get compared to Oracle RAC, we’re quite different (RAC is shared everything, we’re shared nothing). ...