The current ESXi server I am building has access to 2 local data strores. both consist of 2 drives mirrored. The first pair of drives are 10k SAS (300Gb) . The second pair of drives are 7k SAS (500Gb).
For my Windows SQL server I'd planned to put the system vmdk file on the 10k datastore (where my c:\windows would reside). Then use a thin porivisioned vmdk on the 7k datastore for the D: drive and the SQL databases.
The same would apply for my IIS server - using the D:drive for the inetpub dir.
Would I be better doing this the other way round ? So that I was using the faster datastore for the D: drives - the SQL and inetpub data respectively?