Thanks for the clarification. In this specific case v3 is a Haswell-noTSX while v4 is a Broadwell, with the latter that has 6 more features (according to the cpu_map.xml )
So, I reckon an agent.properties set as follows would work: guest.cpu.mode=custom guest.cpu.model=Haswell-noTSX Thanks again On 10 February 2017 at 19:07, ilya <ilya.mailing.li...@gmail.com> wrote: > https://media.readthedocs.org/pdf/cloudstack-installation/4. > 8/cloudstack-installation.pdf > > Page 76 explains it.. you want for CPU instructions sets to match and be > consistent if you plan to run v3 and v4 cpus in the same cluster. > > Regards > ilya > > On 2/10/17 8:23 AM, Rafael Weingärtner wrote: > > From my experience, yes it would work. > > > > At the end what matter are the CPU capabilities, meaning the instructions > > tha can be used by operating systems (O.S) and their processes, in this > > case, VMs can be considered processes in the hypervisor (hypervisors are > > OS). We normally do the masking to hide features that may only be > available > > in one host or other; when you migrate a VM of a host (without masking), > if > > the VM ends up in a host that does not have the same CPU features it may > > crash or present unexpected behaviors. > > > > On Fri, Feb 10, 2017 at 11:15 AM, Nando Beifiori < > nandobeifi...@gmail.com> > > wrote: > > > >> Hi Rafael, > >> > >> in this case the hypervisor is KVM and I think it supports masking, but > let > >> me check if I got it right: > >> > >> if the CPU is not exactly the same the features can be masked using > >> hypervisor's capabilities. > >> > >> Does it mean that if the CPU has the exact same features but different > >> frequency for example it would work? > >> > >> Thanks > >> > >> On 10 February 2017 at 15:46, Rafael Weingärtner < > >> rafaelweingart...@gmail.com> wrote: > >> > >>> It depends on your hypervisor. > >>> For XenServer, you should check the CPU feature you have and if the CPU > >>> supports masking [1]. > >>> > >>> xe host-cpu-info > >>>> > >>> > >>> Look for the "features" information, and then check if your hardware > guy > >>> can provide a processor with similar features or one that supports > >> masking > >>> the same features as your current servers' CPUs. > >>> > >>> [1] https://support.citrix.com/article/CTX127059 > >>> > >>> On Fri, Feb 10, 2017 at 10:28 AM, Nando Beifiori < > >> nandobeifi...@gmail.com> > >>> wrote: > >>> > >>>> Hi all, > >>>> > >>>> quick but very important question: I have a cluster with Intel Xeon > >>> E5-2667 > >>>> v3 CPUs and I need to add another host, but my provider has replaced > >> the > >>> v3 > >>>> with the v4 of the same CPU. > >>>> > >>>> The differences are: > >>>> > >>>> - Lithography (22nm > 14nm) > >>>> - Cache size (20MB > 25MB) > >>>> - Max Memory Bandwidth (68 GB/s > 76.8 GB/s) > >>>> - Intel TSX-NI feature which is present in v4 but not in the v3. > >>>> > >>>> Frequency, turbo frequency and cores are exactly the same. > >>>> Would it be possible to add the new host to the same cluster or should > >> I > >>>> create a new cluster or maybe look for a provider that still has the > v3 > >>>> CPU? > >>>> > >>>> Cloudstack version is 4.9 and hosts use Centos 7.2. > >>>> > >>>> Thanks in advance > >>>> > >>> > >>> > >>> > >>> -- > >>> Rafael Weingärtner > >>> > >> > > > > > > >
