Marketing maybe but most people sad what in low load VM show performance really near real hardware.
Ever bought a car? How about a TV? They ALWAYS tell you more than it does. In short they LIE! maybe not on purpose, but they don't know the WHOLE truth.
Sorry to burst your bubble, but that's why they give you 3 things:
A way to test it FIRST!
Consolidation Tool to ensure that those candidates for VM's MAY be a good candidate BEFORE you begin
And also white papers so you can see the data for yourself and how it works, and read the information regarding the little sub text (sometimes referred to as small print). YOU'RE Mileage may vary. NOT everyone has the SAME results.
There are too many variables.
Maybe this particular VM may not work, but hardware, testing AND trying it on DIFFERENT types of machines may yield better results.
I am saying that you can test it on different machines, maybe others will perform better, but not ALL VM's and all conversions will be good for VM. Maybe you need to build a VM and do FRESH installs, when you do a Physical to virtual that may have complications as well (left over drivers, drivers that are not compatible with VM, uneeded drivers, etc..). There are LOTS of reasons.
But overall VM's will not perform even CLOSE to the hardware equivalent, and maybe a 33% of the hardware may be a little low, but 50-60% of the original host is more realistic. Do not expect too much.
Whatever marketing or sales tells you, is based upon IDEAL BEST CASE scenarios also, so before you buy ANY THING ELSE I advise you to ALWAYS try BEFORE you buy...
I hear about huge email clusters on heavy load based fully on VMware ESX.Well Oracle, SAP, Microsoft just wants to SELL you a product. If your ONLY option is VM, of course they won't want to detour you from their product. I can tell you, that Databases and SAP (of which I have personal up close experience with ALL 3) and I can guarantee you, you do NOT want to virtualize ANY of those.
That's just something I have learned, albeit the hard way. People will tell you, "oh it's not that bad...". BULL PUCKY! That is complete and utter HYPE! Don't believe the hype.
You already say it's not performing CLOSE to the hardware you had before, so now tell me who is lying now? Them or me? I see the same as you, I have tried tweaking NO NEW RESULT. Don't waste your time, some things cannot be virtualized and if they are they just won't work as well, that's the PLAIN truth.
Move on to something else, and you may get better results.
To me SAP, Oracle nor SQL Server are NOT viable candidates for VM's, period. I don't care WHAT anyone tells you. Yeah they work, but not as well . . . .
so you have a machine 8 core 32 GB of RAM and you get 25000 IOPs on physical hardware. now you move it to a VM, you get 50% of that.. you paid $10K for a license you want $5k performance from a $10K investment? I wouldn't...
Leave it where you get the MOST out of it, that's what I am saying. Believe marketing or your eyes... and I am telling you, it doesn't get any better.
To me I believe in getting ALL you can, you can't get ALL you can from a VM for SQL/SAP/Oracle, no even close.
You can do more with hardware, which is HOW you should be looking at it however. That SAME 8 x 32 machine can host 40 VM's. Would you expect ideal performance from ALL running processes at once? HARDLY.
That's the bottom line.
