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.
Junk.