Am 01.07.2013 20:11, schrieb Junk:
On Sat, 2013-06-29 at 23:51 +0200, Reindl Harald wrote:
>
> Am 29.06.2013 23:38, schrieb Bill Davidsen:
>> Reindl Harald wrote:
>>> "model name: QEMU Virtual CPU version 1.0.1"
>>> what the hell - on VMware you have the same CPU as the host and only
"VMware EVC"
>>> is filtering CPU capabilities to provide relieable hot-migration between
hosts
>>> by make only the flags of the oldest CPU in the cluster visible to guests
>> That's why we use KVM, migrations may not be within a cluster. Or be real
time "migrations" as you are thinking of
>> it, but rather may involve being backed up until the next time there is a support
need for the machine. Different
>> environment, different goals
>
> the goal of virtualization in production is live-migartion and failover
> this way you hve zero downtime at host-upgrades / reboots
>
>>> that's why a VMwar eguest has around 95-98 % of the native performance
because
>>> there is only few binary translation and most instrcutions are passed 1:1
>>>
>> And as I remember if there was one old machine in the cluster you wouldn't
have the aes instruction either.
>> That's from docs, haven't tried VMware in a very long time
>
> that is why i mentioned "VMware EVC"
>
> you hardly need this because any running process inside a virtual machine will crash
if
> it is using CPU instructions which are not available on the CPU of the target host
after
> a migartion and with "VMware DRS" the cluster automatically starts
live-migartions
> if one host is overloaded while others are idle to spread the load of the guests
> in a useful manner to the available hosts
>
> virtualization is the base of my daily job and afer working some time
> with this features you never ever setup a server on bare metal for
> gain a few percent more peformance with no safety net or way too complex
> HA setups inside the machines itself inseatd have them a layer deeper
> than your production OS
>
> well, i love opensource and on the guests Fedora/CentOS is running but
> until now there is no opensource solution which can beat VMware on
> certified hardware with proper support
>
Ovirt does this for free, as does the Redhat Product RHEV
https://gb.redhat.com/products/cloud-computing/virtualization/ Live
migration with HA is part of the base package. You don't need to buy an
extra subscription
that's all nice, but until now you do not get certified appliances running on it
like
https://www.barracuda.com/products/spamandvirusfirewall/vx or things like
http://www.vmware.com/products/datacenter-virtualization/vsphere/data-pro...
out of the box which beats most backup-solutions in efficiency and in case
of disaster recovery
until now there are things coming partly close to the VMware ecosystem but
i see nothing which is able to beat them in context of *easy* managment
to bother only with the stripped down linux guest systems