Type-1 Hypervisors?

ponder

ponder

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Can someone point me to a list of Type-1 Hypervisors please.

In case you are confused a Type-1 Hypervisor does not require a guest OS to run on.
 
ya basically got xen and vmware esxi. the rest are all piddletwat. although there are a lot of piddletwats.
 
If you know what Type-1 Hypervisor is, then why do you bother asking for a list of them? I don't even know of one.

VMWare & XEN are the 2 leading fully virtualized hypervizors but still require an OS to run on.
 
SoftDux-Rudi said:
If you know what Type-1 Hypervisor is, then why do you bother asking for a list of them? I don't even know of one.

VMWare & XEN are the 2 leading fully virtualized hypervizors but still require an OS to run on.
Click to expand...

Huh? My first choice is Citrix XenServer followed by vSphere (ESX/i)
 
Conradl said:
Huh? My first choice is Citrix XenServer followed by vSphere (ESX/i)
Click to expand...
Both still require an OS to run on ;) And as I said initially, VMWare (of which ESX/i is part of) and XEN (which Citrix XenServer is built upon) are the 2 leading hypervisors. There's no true "Tier-1" hypervisors though, they all still need a base OS to run on.
 
A type one hypervisor does not mean that it has no OS (although it is the way that it is generally described) - everything has an OS, even Cell Phones, routers and dish washers. A more accurate description is to say that a type two HV is a clear second layer software platform i.e. a system call will go Guest OS > Hypervisor > Host OS > Hardware. A type 1 call will go Guest OS > Hypervisor > Hardware. The lack of the Host OS is why type 1 HV are considered to be OS'less.
 
SoftDux-Rudi said:
If you know what Type-1 Hypervisor is, then why do you bother asking for a list of them?
Click to expand...

Because I don't know which ones are Type-1, is that really so hard to understand. I know of the normal VMware, Virtualbox etc as that is all I have experience with. Sorry for asking.
 
SoftDux-Rudi said:
There's no true "Tier-1" hypervisors though, they all still need a base OS to run on.
Click to expand...
Microsoft Hyper-V. Hypervisor loads first, then the management OS on top of it.

ponder said:
Because I don't know which ones are Type-1
Click to expand...
wiki quote for you
Note: Microsoft Hyper-V (released in June 2008)[2] exemplifies a type 1 product that is often mistaken[by whom?] for a type 2. Both the free stand-alone version and the version that is part of the commercial Windows Server 2008 product use a virtualized Windows Server 2008 parent partition to manage the Type 1 Hyper-V hypervisor. In both cases the Hyper-V hypervisor loads prior to the management operating system, and any virtual environments created run directly on the hypervisor, not via the management operating system.
Click to expand...
 
SoftDux-Rudi said:
Did you read what I said? They still need an OPERATING SYSTEM to run on top of.
Click to expand...
I did.

I never said there is no operating system. Something will have to *operate* the hardware. I said Hyper-V is a type 1 hypervisor.
Untitled6.png

  • Red is where the resource allocation happens
  • Type 1 has 1 less level
  • Type 2 lowest level does not know about the guest OSs. It just sees the VirtualBox application.
  • Type 1 lowest level does know about the guest OSs because its managing them.

If you don't believe me you can read it on wikipedia
* Type 1 (or native, bare metal) hypervisors run directly on the host's hardware to control the hardware and to monitor guest operating systems. A guest operating system thus runs on another level above the hypervisor.

This model represents the classic implementation of virtual machine architectures; the original hypervisor was CP/CMS, developed at IBM in the 1960s, ancestor of IBM's z/VM.

* Type 2 (or hosted) hypervisors run within a conventional operating system environment. With the hypervisor layer as a distinct second software level, guest operating systems run at the third level above the hardware.
Click to expand...

If you like you can even call the type 1 hypervisor an operating system....it makes no difference since the type 1 definition has nothing to do with what does or does not qualify as an OS.
 
So if I understand it correctly that will make the PS3 a true tier1 (firmware) hypervisor?
 
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ponder said:
Because I don't know which ones are Type-1, is that really so hard to understand. I know of the normal VMware, Virtualbox etc as that is all I have experience with. Sorry for asking.
Click to expand...

VMware makes both type 1 and type 2. VMware Workstation, Server (Free) and Player are type 2 HVs. VMware Sphere and ESXi (Free) are type one. Citrix XenServer (also free) is a type 1 HV.

I am Penguin said:
So if I understand it correctly that will make the PS3 a true tier1 (firmware) hypervisor?
Click to expand...

No. You could run both XenServer and ESXi from firmware - and they would still be type one. You could also run VMware Workstation from an XP thinclient, with the OS/Software running from a ROM chip - Workstation would still be a type two HV. As I mentioned above, the Type1/2 is technically not about the OS, but rather the sequence of communication between hardware and guest OS:

Type 2 = Guest OS > Hypervisor > Host OS > Hardware.
Type 1 = Guest OS > Hypervisor > Hardware

Loading VMWare workstation on a PS3 would still make it a type 2 HV.

And despite what is being said, there are true type 1 hypervisors, based on the above definition....
 
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