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
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