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-protection.html 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
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