KVM or OpenVZ

[GarthK]

Is there ever a time when KVM is preferred over OpenVZ when either is an option?

Just curious...
Garth

 

[dietmar]

Is there ever a time when KVM is preferred over OpenVZ when either is an option?

Hmm, difficult question - I guess not (as long as both are an option).

 

[GarthK]

I kind of figured that was the case but wasn't sure.

Thanx,
Garth

 

[udo]

Hi,
kvm or openvz depends on your usecase.

kvm
cons:
performance-penalty (io and cpu)
more resources needed for the host
pros:
easy and fast (live-) migration with external storage
usability of new kernel
flexible - you can migrate a virtual machine also to real hardware, or to another virtualisation platform and vice versa.

openvz
cons:
only "old" kernel 2.6.18 and 2.6.24
only local storage
migration to other platforms (true hardware, kvm...) not easy - it's a new install with transfer the config and data-files
no kernel-modules can be loaded by the guest
pros:
good performance
less resources needed for the host

Perhaps thats not all points...

Udo

 

[BiagioParuolo]

Kvm gives more isolation respect OpenVZ...

 

[stef1777]

openVZ is so nice to use.

;-)

 

[vlad]

Typically I prefer to use OpenVZ for everything because it has the best native speed, especially for hard drive access and great RAM/space sharing system. Unfortunately OpenVZ can not run everything: Windows, Java, complicated iptables firewall and etc., that's where KVM comes in. Isnt obvious?

 

[nicolasdiogo]

Thanks Vlad,

i was confused while trying to run some applications (mainly java) when using openVZ; but after moving the applications to a KVM system, it is working fine.

Nicolas

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