New installation of SQL Server, disable the write cache?

Hello, I'm under ESXi 5.1 and I need to configure a virtual machine Windows server 2012 for our first virtual SQL Server.  My database guy tells me that I have to disable the cache write for SQL best practices.  Is it always true when it is a virtual machine?  If it is true where would I turn it off?  To add a bit more info about our storage on a network SAN Dell EqualLogic and we will use SQL 2008 as SQL 2012 is not yet supported.  Thanks for the help!

I think that your SQL guy assumes the ESXi host will be caching on its own transparent for the VM by default. This is incorrect, ESXi does nothing like that.

The only place where caching of write i/o can happen is on the side of physical storage outside ESXi, so in your case the SAN controllers (no reason not to have this license here too long as it is on battery/flash) or the discs themselves (ugh, it is never enabled by default for a good reason).

BTW: I'm pretty sure that SQL 2008 is not supported on Server 2012.

Tags: VMware

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