Memory overhead recommended for benchmarking SQL server 2005 on vSphere

5 pts.
Tags:
Physical hosts
SQL Server 2005
SQL Server memory
Virtual Machines
vSphere
For a 'direct' physical to VM comparison of SQL server 2005, would anyone recommend giving the VM extra (say, 1.5GB) RAM to compensate for any overhead the OS needs? So a direct comparison would then be 1vCPU, 2.5GB RAM VM & SQL set to use 1GB RAM) vs. SQL on physical host set to use 1CPU and 1GB RAM.
ASKED: July 31, 2009  8:09 PM
UPDATED: July 31, 2009  10:15 PM

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You shouldn’t need to. The OS on both the physical and virtual servers should need the same amount of overhead. For the VM the host OS will take the memory overhead that it needs from the host’s memory not the guests.

If you were going to give the VM memory to cover the overhead, most my VMs only have 100 Megs or so of overhead (I’m using ESX 3.5 though).

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