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post #1011 of 4211
Quote:
Originally Posted by parityboy View Post

- Stability. Virtualised "hardware" will always be the same, no matter what the underlying physical hardware is.
- Stability. Each application stack can run on a known "hardware"/OS combination. Upgrades can be tested in a contained environment, away from a production installation and without having to buy new hardware.

Good additions smile.gif

Though depending on the hypervisor and whether or not it has a compatibility mode there is a bit of a but to point 1.
    
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post #1012 of 4211
That's a very good point actually: with the likes of KVM and ESXi, how transparent is the PCI pass-through mode? Can the guest see a PCIe card's BIOS for example?
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post #1013 of 4211
I'm almost done with my server and can post picks now.

I use it as a storage, streaming, bedroom htpc and some gaming to on high/mid. At some point I will use it as a
DVR server for security cameras.

Specs:
AMD A6 3500 x3 2100Ghz APU
ASUS FM1 Motherboard
Patriot 16GB DDR3 1600 1.5v
Corsair 430CX v2
NZXT H2 White case
Asus Blu-Ray drive
OCZ 90GB Agility 3 SSD
Hitachi 5x2TB 7200rpm drives in Raid 5 (8TB storage)
Zerotherm Nirvana CPU Cooler













Edited by Sodalink - 11/6/12 at 12:12pm
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post #1014 of 4211
Quote:
Originally Posted by parityboy View Post

That's a very good point actually: with the likes of KVM and ESXi, how transparent is the PCI pass-through mode? Can the guest see a PCIe card's BIOS for example?

We use ESXi 4.1 at work and run all the hosts in Enhanced VMWare Compatibility Mode, which means the VM's are presented an emulated CPU that is then passed by the hypervisor to the physical CPU.

No direct BIOS access, though you can copy strings from the host to the VM via ESXi

This allows VMotioning machines onto any host running the same EVC mode regardless of underlying hardware.
We have 3 generations of Intel servers in our environment so it saved us a lot.

I run Xen at home, and I believe it is the same.
But since I have only one host, there is no sense in using compatibility mode, so I can't tell you for sure.
Edited by dushan24 - 11/5/12 at 11:02pm
    
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post #1015 of 4211
Quote:
Originally Posted by dushan24 View Post

We use ESXi 4.1 at work and run all the hosts in Enhanced VMWare Compatibility Mode, which means the VM's are presented an emulated CPU that is then passed by the hypervisor to the physical CPU.

This allows VMotioning machines onto any host running the same EVC mode regardless of underlying hardware.

You are correct. ESXi presents the CPU to all of the hosts using the lowest common denominator of all of the CPUs of the hosts.
    
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post #1016 of 4211
Stupid question: why would the guest CPU be passed to the host? Does the host actually see it as a CPU (and treat it as part of an SMP setup) or as some kind of kernel process?
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post #1017 of 4211
It's not really passing the CPU but more so cloaking the actually CPU in the host to the LCD (lowest common denominator) CPU found among all of the hosts. Does that make more sense?
    
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post #1018 of 4211
Yes. smile.gif
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post #1019 of 4211
Sorry, I didn't explain it perfectly.
    
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post #1020 of 4211
Quote:
Originally Posted by Peanuthead View Post

You are correct. ESXi presents the CPU to all of the hosts using the lowest common denominator of all of the CPUs of the hosts.

Only if you tell it to smile.gif
    
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