Hi, I am new to virtualization and I am having the obvious hassle of choosing between Xen and KVM. Can Xen experts help me with this? Regards, Arindam _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
On Wed, May 16, 2012 at 4:49 PM, Arindam Choudhury <arindam@live.com> wrote:> Hi, > > I am new to virtualization and I am having the obvious hassle of choosing > between Xen and KVM. > > Can Xen experts help me with this?Have you tried either? Just you whatever you''re comfortable with. Personally I like xen better. It used to be that PV guests have massive performance benefit compared to HVM or KVM, but AFAIK it is not the case anymore. -- Fajar
On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote:> Hi, > > I am new to virtualization and I am having the obvious hassle of choosing > between Xen and KVM.Hi, it depends on how much time you have. I prefer XEN, absolutely, but if you hurry and you are not patient, KVM could be a valid alternative. Of course if you ask here this question, it is unlikely to find people suggesting KVM instead of XEN ;-) -- Flavio
Am Mittwoch, 16. Mai 2012, 11:49:37 schrieb Arindam Choudhury:> I am new to virtualization and I am having the obvious hassle of choosing > between Xen and KVM. > > Can Xen experts help me with this?We mainl use Xen AND KVM (HP Ilo2) for remote access to server machines in remote IP NOCs. Choosing Xen is not only a question of remote managament in most cases and using it just to have remote management could be "oversized" in many cases. There are a lot of further advatages (ressource management and efficiency) which xen offers to system administrators - if they are interestig for you depends form your application. hth cheers, Niels. -- --- Niels Dettenbach Syndicat IT & Internet http://www.syndicat.com --- _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
> From: fbcyborg@gmail.com > Date: Wed, 16 May 2012 11:56:31 +0200 > Subject: Re: [Xen-users] Xen or KVM > To: arindam@live.com > CC: xen-users@lists.xen.org > > On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote: > > Hi, > > > > I am new to virtualization and I am having the obvious hassle of choosing > > between Xen and KVM. > Hi, > > it depends on how much time you have. I prefer XEN, absolutely, but if you > hurry and you are not patient, KVM could be a valid alternative. > Of course if you ask here this question, it is unlikely to find people > suggesting > KVM instead of XEN ;-)yes, My question should be if I want to run I/O intensive jobs. Which is more suitable? And also, to learn Xen 4, which materials you experts suggest? Regards, Arindam _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
> From: fbcyborg@gmail.com > Date: Wed, 16 May 2012 11:56:31 +0200 > Subject: Re: [Xen-users] Xen or KVM > To: arindam@live.com > CC: xen-users@lists.xen.org > > On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote: > > Hi, > > > > I am new to virtualization and I am having the obvious hassle of choosing > > between Xen and KVM. > Hi, > > it depends on how much time you have. I prefer XEN, absolutely, but if you > hurry and you are not patient, KVM could be a valid alternative. > Of course if you ask here this question, it is unlikely to find people > suggesting > KVM instead of XEN ;-)The question is why you personally like Xen? What benefits you getting over KVM? Regards, Arindam _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
On Wed, May 16, 2012 at 5:04 PM, Arindam Choudhury <arindam@live.com> wrote:> > >> From: fbcyborg@gmail.com >> Date: Wed, 16 May 2012 11:56:31 +0200 >> Subject: Re: [Xen-users] Xen or KVM >> To: arindam@live.com >> CC: xen-users@lists.xen.org >> >> On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote: >> > Hi, >> > >> > I am new to virtualization and I am having the obvious hassle of >> > choosing >> > between Xen and KVM. >> Hi, >> >> it depends on how much time you have. I prefer XEN, absolutely, but if you >> hurry and you are not patient, KVM could be a valid alternative. >> Of course if you ask here this question, it is unlikely to find people >> suggesting >> KVM instead of XEN ;-) > > The question is why you personally like Xen? What benefits you getting over > KVM?It used to be that Xen PV delivers superior I/O performance. So we''ve used it extensively with RHEL5 dom0 and its bundled version of xen (xen 3.1.2+, kernel 2.6.18.x). However depending on how you test it, recent version of xen actually suffer from reduced performance compared to older version (search list archive for details). My personal benchmark (two years ago, I think) using mysql+sysbench and fio, comparing RHEL5+xen, RHEL6+kvm, and vmware, pretty much shows the same result though. That''s why I said use whatever you''re comfortable with. I''d be better if you can perform your own benchmark, using test load specific to your particular environment. -- Fajar
On Wed, May 16, 2012 at 5:10 PM, Fajar A. Nugraha <list@fajar.net> wrote:> On Wed, May 16, 2012 at 5:04 PM, Arindam Choudhury <arindam@live.com> wrote: >> >> >>> From: fbcyborg@gmail.com >>> Date: Wed, 16 May 2012 11:56:31 +0200 >>> Subject: Re: [Xen-users] Xen or KVM >>> To: arindam@live.com >>> CC: xen-users@lists.xen.org >>> >>> On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote: >>> > Hi, >>> > >>> > I am new to virtualization and I am having the obvious hassle of >>> > choosing >>> > between Xen and KVM. >>> Hi, >>> >>> it depends on how much time you have. I prefer XEN, absolutely, but if you >>> hurry and you are not patient, KVM could be a valid alternative. >>> Of course if you ask here this question, it is unlikely to find people >>> suggesting >>> KVM instead of XEN ;-) >> >> The question is why you personally like Xen? What benefits you getting over >> KVM? > > It used to be that Xen PV delivers superior I/O performance. So we''ve > used it extensively with RHEL5 dom0 and its bundled version of xen > (xen 3.1.2+, kernel 2.6.18.x). However depending on how you test it, > recent version of xen actually suffer from reduced performance > compared to older version (search list archive for details). > > My personal benchmark (two years ago, I think) using mysql+sysbench > and fio, comparing RHEL5+xen, RHEL6+kvm, and vmware, pretty much shows > the same result though. That''s why I said use whatever you''re > comfortable with.Just to be clear, by "the same result" here I mean the performance of the three setup is roughly the same, the difference is not statistically significant. -- Fajar
When you ask a bunch of Xen experts if they prefer Xen or KVM, you should be able to guess the answer you will receive. :-) -----Original Message----- From: xen-users-bounces@lists.xen.org [mailto:xen-users-bounces@lists.xen.org] On Behalf Of Arindam Choudhury Sent: Wednesday, May 16, 2012 4:50 AM To: xen Subject: [Xen-users] Xen or KVM Hi, I am new to virtualization and I am having the obvious hassle of choosing between Xen and KVM. Can Xen experts help me with this? Regards, Arindam _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
What type of guest OS do you plan to run? Will it be Windows, Linux, or a mix of the two? If it is purely Linux, you may want to look at OpenVZ as well as Xen and KVM since you mentioned the jobs would be I/O intense. -----Original Message----- From: xen-users-bounces@lists.xen.org [mailto:xen-users-bounces@lists.xen.org] On Behalf Of Arindam Choudhury Sent: Wednesday, May 16, 2012 5:02 AM To: xen Subject: Re: [Xen-users] Xen or KVM> From: fbcyborg@gmail.com > Date: Wed, 16 May 2012 11:56:31 +0200 > Subject: Re: [Xen-users] Xen or KVM > To: arindam@live.com > CC: xen-users@lists.xen.org > > On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote: > > Hi, > > > > I am new to virtualization and I am having the obvious hassle ofchoosing> > between Xen and KVM. > Hi, > > it depends on how much time you have. I prefer XEN, absolutely, but if you > hurry and you are not patient, KVM could be a valid alternative. > Of course if you ask here this question, it is unlikely to find people > suggesting > KVM instead of XEN ;-)yes, My question should be if I want to run I/O intensive jobs. Which is more suitable? And also, to learn Xen 4, which materials you experts suggest? Regards, Arindam _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
Am 16.05.2012 12:04, schrieb Arindam Choudhury:> > > > From: fbcyborg@gmail.com > > Date: Wed, 16 May 2012 11:56:31 +0200 > > Subject: Re: [Xen-users] Xen or KVM > > To: arindam@live.com > > CC: xen-users@lists.xen.org > > > > On 16 May 2012 11:49, Arindam Choudhury <arindam@live.com> wrote: > > > Hi, > > > > > > I am new to virtualization and I am having the obvious hassle of > choosing > > > between Xen and KVM. > > Hi, > > > > it depends on how much time you have. I prefer XEN, absolutely, but > if you > > hurry and you are not patient, KVM could be a valid alternative. > > Of course if you ask here this question, it is unlikely to find people > > suggesting > > KVM instead of XEN ;-) > > The question is why you personally like Xen? What benefits you getting > over KVM?Arindam, After playing for over a year with Xen (Xen/XCP/XenServer) and KVM I tend now to use KVM due to low I/O performance of Xen/XCP/XenServer when using HVM. PVMs in Xen have probably a bit better I/O-performance but quite a lot of overhead to manage it with different operating systems (I don''t run any MS OS). Due to my tests (HVM) on the same hardware (like HP DL385g7 servers with two Opteron 6180SE CPUs and 32 or 64GB RAM, an additional RAID-controller P410 (in total 16 hard disk drives) and additional quad port 1GBit NIC) the network performance on KVM is at least 3 times higher compare to Xen. Also the I/O-performance for storage (RAID60 or RAID50) is at least two times higher on KVM. The free available version of XCP or XenServer has outdated templates for HVM / PVMs and it looks like that Citrix doesn''t really have commercial interesst to improve them. I don''t think that it will change in the near future as most active Xen developers are working for Citrix. People like you, me and many others are a kind of unpaid Xen software testers. I can myself invest some of time for testing of free software products and help to impove them if I can use them without all the licensing issues. I was even thinking about buying commercial XenServer ... but due to high costs of the licenses and management costs I decided simply to buy new hardware to have much better performance (DB cluster applications) and more calculatlion power for the same price and less administration overhead. Another issue is, that I am *not* going to use MS-clients (XenCenter MS-based GUI) for adiministration of Linux/Unix environment. In my opinion Citrix products are getting more and more MS oriented (what probably makes sense from bean counters'' point of view as they follow the goal of biggest turnover and profit). Independent of my own opinion above I have to say that XenServer has quite nice CLI (xe) I used for scripting even somehow it lucks some logical syntax rules (eg. you can export a template but you *can''t* import it with the same "import" (instead of export) syntax). Importing them as VMs and changing an appriopriate flag after didn''t work as expected. My current recomendation is currently KVM based on uBuntu 12.04. Just uBuntu and not another one as other commercial Linux distributors play other games ... Regards, Mark ps. All trademarks or registered trademarks herein are the property of their respective owners. -- ms@it-infrastrukturen.org http://rsync.it-infrastrukturen.org _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
Arindam Choudhury <arindam@live.com> writes: #The question is why you personally like Xen? What benefits you getting over KVM? I''m fairly new to Xen and virtualization for that matter, but I tested both xen and kvm before I deployed my first live VM. I ended up with xen simply for the fact that I liked the management of the VM''s better than kvm. The .cfg files are easier to read and configure, and the xm tools are simple and give quick, easy to read info. We run a mix of Microsoft Server and Debian VM''s. Xen hosted on Debian. The online documentation and this user list were also important factors. There was some discussion a few years ago about xen not entirely being in the linux kernel and that bothered some folks, where kvm was built in. But IIRC, I believe now that xen is part of the 3.x kernel. Cheers, Mike _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Michael Egglestone <mike@estone.ca> schrieb:>#The question is why you personally like Xen? What benefits you getting >over KVM?...ouch, sorry for my noise - i''ve misunderstanded your question completely. There are many points why i would hardly prefer XEN over kvm or others in most cases when i want to virtualize Linux or NetBSD, but the most important are: 1.) XEN PV offers very ressource efficient hardware usage and a maximum of performance by a very low (to theoretically none in special circumstances) virtualization overhead. 2.) The security structures are the most transparent for me. As i wrote: I mainly paravirtualize Linux or xen guests in server or appliance applications and even partly on desktops. Desktop full virtualization might be more comfortable with solutions like VirtualBox or Parallels - but even this depends from what you would do and how far the user has to be invloved on which knowledge level into the VM management / usage as there is no such full (free) GUI for xen desktop virtualization afaik. hth best regards, Niels. cheers, Niels. - -- Niels Dettenbach Syndicat IT&Internet http://www.syndicat.com -----BEGIN PGP SIGNATURE----- Version: APG v1.0.8 iIEEAREIAEEFAk+zyIM6HE5pZWxzIERldHRlbmJhY2ggKFN5bmRpY2F0IElUJklu dGVybmV0KSA8bmRAc3luZGljYXQuY29tPgAKCRBU3ERlZRyiDX1/AJsFwwvaPc19 mLmywByf8TXszXSi7ACfWS1MBmIE/fX9kWnAU6SP9cuDHco=W8BV -----END PGP SIGNATURE-----
On Wed, May 16, 2012 at 6:49 AM, Arindam Choudhury <arindam@live.com> wrote:> Hi, > > I am new to virtualization and I am having the obvious hassle of choosing > between Xen and KVM. > > Can Xen experts help me with this? > > Regards, > > Arindam >if you ask in xen mailing list then the answer is xen if you ask in kvm mailing list then the answer is kvm both are good, try and make your choice. -- ------------ Itamar Reis Peixoto msn, google talk: itamar@ispbrasil.com.br +55 11 4063 5033 (FIXO SP) +55 34 9158 9329 (TIM) +55 34 8806 3989 (OI) +55 34 3221 8599 (FIXO MG)
Hi, On 17/05/2012 4:04 AM, Itamar Reis Peixoto wrote:> if you ask in xen mailing list then the answer is xen > if you ask in kvm mailing list then the answer is kvmWell, I''ve been using Xen, however there is a machine that would be really good to use -- but xen will not work on it, fails to boot properly. IBM X3850 8864 .... so that machine now has Oracle Linux 6 on it and I''ll probably end up switching to KVM as it has much better support in the kernel and I''ve had no help on the X3850 when I''ve asked questions here. Cheers -- Kind Regards AndrewM Andrew McGlashan
Is it just for servers, then go xen, do you plan on doing VDI (windows) then again xen has good solutions. Plan on doing Linux VDI look at Ovirt a kvm solution On Wed, May 16, 2012 at 2:30 PM, Andrew McGlashan < andrew.mcglashan@affinityvision.com.au> wrote:> Hi, > > On 17/05/2012 4:04 AM, Itamar Reis Peixoto wrote: > > if you ask in xen mailing list then the answer is xen > > if you ask in kvm mailing list then the answer is kvm > > Well, I''ve been using Xen, however there is a machine that would be > really good to use -- but xen will not work on it, fails to boot > properly. IBM X3850 8864 .... so that machine now has Oracle Linux 6 on > it and I''ll probably end up switching to KVM as it has much better > support in the kernel and I''ve had no help on the X3850 when I''ve asked > questions here. > > Cheers > > -- > Kind Regards > AndrewM > > Andrew McGlashan > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
Hello friends In my opinion the diference is, this environment is test/desenv?? Ok ..., is homolog or production ??!! Hummm, the client really need a help/support of one company! If The Client have a company who give The Support in OS and Products, ok but if isn''t I recommend RedHat! Now talking in RedHat we can talk about kvm and xen! There is a New product named RHEV, Enterprise Virtualization which will provide solutions to virtualization in HA with web manager, a cool suit confronting with vmware! Ps: RHEV use kvm! ;-) So I recommend a research about RHEV and Xen (RedHat recommendations) Cheers ______________ Atenciosamente Waldirio msn: waldirio@gmail.com Skype: waldirio Site: www.waldirio.com.br Blog: blog.waldirio.com.br LinkedIn: http://br.linkedin.com/pub/waldirio-pinheiro/22/b21/646 PGP: www.waldirio.com.br/public.html "Nothing in life is to be feared. It is only to be understood." --Marie Curie Em 16/05/2012, às 16:54, Andrew Wells <agwells0714@gmail.com> escreveu:> Is it just for servers, then go xen, do you plan on doing VDI (windows) then again xen has good solutions. > > Plan on doing Linux VDI look at Ovirt a kvm solution > > On Wed, May 16, 2012 at 2:30 PM, Andrew McGlashan <andrew.mcglashan@affinityvision.com.au> wrote: > Hi, > > On 17/05/2012 4:04 AM, Itamar Reis Peixoto wrote: > > if you ask in xen mailing list then the answer is xen > > if you ask in kvm mailing list then the answer is kvm > > Well, I''ve been using Xen, however there is a machine that would be > really good to use -- but xen will not work on it, fails to boot > properly. IBM X3850 8864 .... so that machine now has Oracle Linux 6 on > it and I''ll probably end up switching to KVM as it has much better > support in the kernel and I''ve had no help on the X3850 when I''ve asked > questions here. > > Cheers > > -- > Kind Regards > AndrewM > > Andrew McGlashan > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
On Wed, 2012-05-16 at 19:30 +0100, Andrew McGlashan wrote:> I''ve had no help on the X3850 when I''ve asked questions here.If the machine fails to boot at all then this is very likely to be a bug rather than a misconfiguration, please do consider posting details to the xen-devel@ list if no help has been forthcoming here. If you do end up posting to xen-devel@ then collecting a log of the failed boot first would be very useful. Ian.
Mark Schneider <ms@it-infrastrukturen.org> wrote:> After playing for over a year with Xen (Xen/XCP/XenServer) and KVM I > tend now to use KVM due to low I/O performance of Xen/XCP/XenServer > when using HVM. PVMs in Xen have probably a bit better I/O-performance > but quite a lot of overhead to manage it with different operating > systems (I don''t run any MS OS).[...]> The free available version of XCP or XenServer has outdated templates > for HVM / PVMs and it looks like that Citrix doesn''t really have > commercial interesst to improve them. I don''t think that it will change > in the near future as most active Xen developers are working for > Citrix. > People like you, me and many others are a kind of unpaid Xen software > testers. I can myself invest some of time for testing of free software > products and help to impove them if I can use them without all the > licensing issues. I was even thinking about buying commercial XenServer > ... but due to high costs of the licenses and management costs I > decided simply to buy new hardware to have much better performance (DB > cluster applications) and more calculatlion power for the same price > and less administration overhead.[...]> My current recomendation is currently KVM based on uBuntu 12.04.Actually I have slipped out of the "xen game" earlier on with the appearance of kvm. Just because of the ease of having it in the mainline kernel. I just wanted to support the other perspective to the discussion: Before choosing between two hypervisor-based virtualization solutions you should decide whether you could use os-based virtualization aka containers (with openvz) instead. This would spare you a lot of hassle, which you subscribe to by choosing a hypervisor-based solution. Even the best hypervisor on the newest hardware will not give you the I/O (network- and storagewise), that an os-based virtualization will give you. In my opinion, you should choose a solution, which will offer you "the best of both worlds": OS-based virtualization for the mass of your VMs and hypervisor-based virtualization for cases, containers can''t cover. That said, have a look at - Proxmox (http://www.proxmox.com/products/proxmox-ve) - openvz/kvm - SmartOS (http://smartos.org/) - solaris zones/kvm - Parallels Server Bare Metal (http://www.parallels.com/products/server/baremetal/sp/) - does anybody know more solutions along those lines (maybe one including xen)? by Töns -- There is no safe distance.
Andrew Wells <agwells0714@gmail.com> wrote:> Is it just for servers, then go xen, do you plan on doing VDI (windows) > then again xen has good solutions. > > Plan on doing Linux VDI look at Ovirt a kvm solutionI just wanted to throw Parallels into the ring here, as well. I don''t know how they compare to Citrix'' solutions but one shouldn''t forget, that Parallels has containers for Windows, too. And - as far as I understand - that makes it a compelling solution in combination with Windows Datacenter Edition, regarding licensing. http://www.netstream.co.il/fileadmin/groups/netstream/Testfolder/Doc/Parallels_Virtualization_VDI.pdf In terms of I/O they should beat all hypervisor-based solutions by far. by Töns -- There is no safe distance.
On Thu, May 17, 2012 at 08:02:46PM +0200, Toens Bueker wrote:> Mark Schneider <ms@it-infrastrukturen.org> wrote: > I just wanted to support the other perspective to the discussion: Before > choosing between two hypervisor-based virtualization solutions you > should decide whether you could use os-based virtualization aka > containers (with openvz) instead. This would spare you a lot of > hassle, which you subscribe to by choosing a hypervisor-based solution.> Even the best hypervisor on the newest hardware will not give you the > I/O (network- and storagewise), that an os-based virtualization will > give you. > > In my opinion, you should choose a solution, which will offer you "the > best of both worlds": OS-based virtualization for the mass of your VMs > and hypervisor-based virtualization for cases, containers can''t cover.The trouble I have with containers is that the compartmentalization? is... much worse. I rented FreeBSD jails before I moved to Xen, and the Jails? disk I/O was terrible. I mean, total throughput was great, far better than xen (I was using 10K disk, too) - but disk IO would ''feel'' slower for any particular user. The thing is, with Xen? the user gets his or her own pagecache. If they login once a week and check their mail and do nothing else? their /etc/passwd /etc/shadow and their mail spool file are all cached in ram. The system feels very fast to the light user. With the Jails? pagecache would be grabbed by the heavy user accessing the disk a lot, so it always seemed slow for that light user. So yeah; from my perspective? Xen and KVM are both vastly easier to administer than a container-based solution, as adaquate pagecache covers a multitude of sins. Of course, you are right about total/overall performance. and in some cases, that''s the important thing. Containers are much lighter weight. I just wouldn''t want to manage a container that I didn''t have root (and knowledge of what to kill) on. Xen and KVM solve the worst of the ''heavy user making it suck for everyone'' problem, and make it much easier for me to limit them without any knowledge of what it''s actually running when it doesn''t automatically take care of it.
I have had problems booting 32bit versions of XEN on 64 bit systems. Try installing/booting 64bit dom0 and then building/booting some hosts... Tomasz On 17 May 2012 17:39, Ian Campbell <Ian.Campbell@citrix.com> wrote:> On Wed, 2012-05-16 at 19:30 +0100, Andrew McGlashan wrote: > > I''ve had no help on the X3850 when I''ve asked questions here. > > If the machine fails to boot at all then this is very likely to be a bug > rather than a misconfiguration, please do consider posting details to > the xen-devel@ list if no help has been forthcoming here. > > If you do end up posting to xen-devel@ then collecting a log of the > failed boot first would be very useful. > > Ian. > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users >-- -- GPG key fingerprint: 3883 B308 8256 2246 D3ED A1FF 3A1D 0EAD 41C4 C2F0 GPG public key available on pgp(dot)net key server _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users
On Fri, 2012-05-18 at 10:32 +0100, TMC wrote:> I have had problems booting 32bit versions of XEN on 64 bit systems. > Try installing/booting 64bit dom0 and then building/booting some > hosts...That is always good advice if you have a 64 bit processor. The 64 bit version of Xen is recommended over the 32 bit version if you have a 64 bit capable processor. Note that you can run a 32 bit dom0 kernel (and userspace) on top of a 64 bit hypervisor if you like (so called "32on64"). Also with a 64 bit hypervisor it is always possible to run either 32 or 64 bit guests (regardless of the dom0 bit width). Ian.> > Tomasz > > On 17 May 2012 17:39, Ian Campbell <Ian.Campbell@citrix.com> wrote: > On Wed, 2012-05-16 at 19:30 +0100, Andrew McGlashan wrote: > > I''ve had no help on the X3850 when I''ve asked questions > here. > > If the machine fails to boot at all then this is very likely > to be a bug > rather than a misconfiguration, please do consider posting > details to > the xen-devel@ list if no help has been forthcoming here. > > If you do end up posting to xen-devel@ then collecting a log > of the > failed boot first would be very useful. > > Ian. > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users > > > > -- > -- > GPG key fingerprint: 3883 B308 8256 2246 D3ED A1FF 3A1D 0EAD 41C4 > C2F0 > GPG public key available on pgp(dot)net key server
On 16 May 2012 19:49, Arindam Choudhury <arindam@live.com> wrote:> Hi, > > I am new to virtualization and I am having the obvious hassle of choosing > between Xen and KVM. > > Can Xen experts help me with this? > > Regards, > > Arindam > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-usersAs a personal opinion, Xen is lightyears ahead of other solutions for our needs (complex high-performance hosting). But it really depends on what you are doing. KVM is a simple solution for a simple problem, Xen is slightly less simple can but solve arbitarily difficult problems and is considerably more mature + better performance. However if all you want to do is play around with virtualisation or use different operating systems at the same time on your desktop then KVM is more than capable and is likely to be less work and easier to understand. In those sorts of situations simply using what you are most comfortable with is what I would advise.. for me that would still be Xen. When push comes to shove in production deployments Xen has shown its metal for many years now and I wouldn''t even dream of building a solution around KVM or VMWare, features like Flask/XSM, ability to dissaggregate driver domains and a very powerful CPU scheduler/weighting system are only a few reasons why to choose Xen. As Luke has already mentioned this sort of capability is vital for managing noisy neighbor in both public hosting/cloud situations and also private clusters where a runaway application can slow all machines on a physical host. The big reason for us is performance, Xens implementation of paravirtualised storage and network drivers surpasses what is available on other hypervisors. Virtio is still immature and a long way behind Xen''s blkback for random IO performance. Naturally I am biased though, I love Xen and we have -alot- of Xen boxes. :) Joseph. -- CTO | Orion Virtualisation Solutions | www.orionvm.com.au Phone: 1300 56 99 52 | Mobile: 0428 754 846