Re: [CentOS-virt] which virtualization platform to choose
On Tue, Jul 27, 2010 at 10:52 PM, Luke S Crawford l...@prgmr.com wrote: Grant McWilliams grantmasterfl...@gmail.com writes: I'm not sure any of the rest of us have ever had to recompile the kernel to get xen to work either. I have 160 or so DomUs on CentOS Dom0s and still haven't recompiled a kernel. how many guests per dom0? for my smallest plans I approach 160 DomUs per dom0, and I /have/ had to recomplile to make that work. (though, it's been rather a long time since I tried it with a CentOS/xen kernel rather than a xen.org kernel.) What kind of situation would you be trying to run 160 DomUs per Dom0? I'd be curious about your particular needs for having that many DomUs per Dom0. Did you run into a hard coded limit on the number of DomUs you could have? Grant McWilliams ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
[CentOS-virt] which virtualization platform to choose
Friends I'm in doubt here: which virtualization platform to choose and why? If I have just installed a VM I choose Xen or KVM? And when I have more than 5 or 10 VM's? Please, I need your help to choose right. Thanks -- Gilberto Nunes ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
On Mon, Jul 26, 2010 at 1:30 PM, Gilberto Nunes gilberto.nune...@gmail.com wrote: Friends I'm in doubt here: which virtualization platform to choose and why? If I have just installed a VM I choose Xen or KVM? And when I have more than 5 or 10 VM's? Please, I need your help to choose right. Thanks -- Gilberto Nunes ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt It depends on which clients are you going to virtualize, personally I like using KVM for the simplicity to run Windows and Linux guests. -- Linux User #452368 http://twitter.com/vpadro Everything that irritates us about others can lead us to an understanding of ourselves ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
KVM seems to have a future in centos. I have a couple of servers running kvm, with only 4 cores per server. I tend use 1 real core for each virtual cpu assigned to the guests, because I don't need that many guests. So, I can't speak to scaling... Performance is excellent, however. It's been a year or more since I've tried ESXi or xen on ubuntu, but I was always disappointed in the speed at which the guests ran. That's why I turned to xenserver for its speed and GUI, and then to KVM for its speed and complete control over things like nics and network configurations. KVM works great ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
Hi... How manu guest do you running?? thanks 2010/7/26 compdoc comp...@hotrodpc.com: KVM seems to have a future in centos. I have a couple of servers running kvm, with only 4 cores per server. I tend use 1 real core for each virtual cpu assigned to the guests, because I don't need that many guests. So, I can't speak to scaling... Performance is excellent, however. It's been a year or more since I've tried ESXi or xen on ubuntu, but I was always disappointed in the speed at which the guests ran. That's why I turned to xenserver for its speed and GUI, and then to KVM for its speed and complete control over things like nics and network configurations. KVM works great ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt -- Gilberto Nunes ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
On Mon, Jul 26, 2010 at 2:03 PM, Gilberto Nunes gilberto.nune...@gmail.com wrote: Hi Victor... Me too!... When the year started, I installed a server with Xen 4.0, with 2.6.31.13 pvops kernel We have 15 VM on a Dell PowerEdge 1950 with 16 GB of memory and SAS disks... This sound like crazy thing I know that... All VM runs Windows 2003 Servers... Now I see that the performance on VM has decrease so much... Perhaps I would change to KVM from xen??? What you thing about??? 2010/7/26 Victor Padro vpa...@gmail.com: On Mon, Jul 26, 2010 at 1:30 PM, Gilberto Nunes gilberto.nune...@gmail.com wrote: Friends I'm in doubt here: which virtualization platform to choose and why? If I have just installed a VM I choose Xen or KVM? And when I have more than 5 or 10 VM's? Please, I need your help to choose right. Thanks -- Gilberto Nunes ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt It depends on which clients are you going to virtualize, personally I like using KVM for the simplicity to run Windows and Linux guests. -- Linux User #452368 http://twitter.com/vpadro Everything that irritates us about others can lead us to an understanding of ourselves ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt -- Gilberto Nunes ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt Perhaps you could run a test lab with the same VMs under KVM, but I can assure you performance will not be overkill, just 5-7% more, nevertheless KVM seems to be more stable on my Server Xeon X3440, 8GB, PERC 6, 8TB running 8 Windows 2K3 R2 VMs, it has been running for six months now without downtime. Saludos. -- Linux User #452368 http://twitter.com/vpadro Everything that irritates us about others can lead us to an understanding of ourselves ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
On Mon, Jul 26, 2010 at 03:30:38PM -0300, Gilberto Nunes wrote: Friends I'm in doubt here: which virtualization platform to choose and why? If I have just installed a VM I choose Xen or KVM? And when I have more than 5 or 10 VM's? Please, I need your help to choose right. It depends on many things. If your hardware doesn't have CPU virtualization extensions, then you only have one choice - Xen. If you want to use 32bit host OS, then you only have one choice - Xen. And if you run mainly Linux VMs then Xen is a good choice. -- Pasi ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
2010/7/26 Pasi Kärkkäinen pa...@iki.fi: On Mon, Jul 26, 2010 at 03:30:38PM -0300, Gilberto Nunes wrote: Friends I'm in doubt here: which virtualization platform to choose and why? If I have just installed a VM I choose Xen or KVM? And when I have more than 5 or 10 VM's? Please, I need your help to choose right. It depends on many things. If your hardware doesn't have CPU virtualization extensions, then you only have one choice - Xen. Yes. All hardware has virt extensions... If you want to use 32bit host OS, then you only have one choice - Xen. Yes... All software is 32 bits And if you run mainly Linux VMs then Xen is a good choice. No... Mostly software is Windows based here... -- Pasi ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt -- Gilberto Nunes ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
On Jul 26, 2010, at 12:03 PM, Gilberto Nunes wrote: [...] What you thing about??? As far as running 15 VMs, whether your hardware is suited to do that depends on how many spindles worth of SAS drives you have (improves concurrency), how busy your VMs are (IO and proc), how much the guests are swapping in case you're not giving them enough memory. And if you're not running virtio drivers, you should! I don't have the numbers, but several months ago I tested a few different Iometer meter workloads on Server 2003 R2 guests on PE1950 hardware against equivalently-matched VMs on the 1.x version of a popular proprietary product (dedicated memory instead of its default swap-mem-to-host-disk; also running the guest extensions), Xen on CentOS 5.4 with a then-recent build of GPLPV (meadowcourt.org/downloads) on the guests, and KVM (also CentOS 5.4) with somebody's build of unsigned virtio Windows drivers (was on a /~public_html from redhat.com I think). Results: Xen+GPLPV beat out KVM+virtio enough to be considered significant, but their difference seemed small compared to the margin they beat the other contender by. The proprietary one also had massive CPU load on the guest generated by running the test that the others didn't have. Obviously that's all very vague, but then again I'm sure somewhere I've accepted a EULA that says I'm not allowed to share benchmarking results for certain products :-). I'll be keeping Xen (and therefore CentOS 5.x) around to run Linux guests blazingly fast on still-usedful hardware. Everything else I'm (slowly) migrating to KVM in the interest of tracking with upstream. Xen's slight performance edge on Windows will be missed. YMMV. Eric ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
Re: [CentOS-virt] which virtualization platform to choose
If you want to use 32bit host OS, then you only have one choice - Xen. Yes... All software is 32 bits I think he meant if you had a 32bit host to run the guests on, and did not mean 32bit guests. If your hardware has virt extensions, then it's a 64bit host. KVM certainly runs 32bit and 64bit guests, and it runs linux guests just as well as windows... ___ CentOS-virt mailing list CentOS-virt@centos.org http://lists.centos.org/mailman/listinfo/centos-virt
