Hi, I''m trying to figure out whether three Qemu/KVM machines inside one Oracle VM (Xen) machine would be a good idea. I am aware that performance, possibly stability as well would suffer, but do you think it''s conceptually possible? I am asking you this instead of trying it myself because I do not have direct access to Oracle VM infrastructure and I am trying to figure out first if this idea makes any sense. What do you think? Thank you, Sever
On Tue, 2012-03-20 at 12:25 +0000, Sever Apostu wrote:> Hi, > > I''m trying to figure out whether three Qemu/KVM machines inside one > Oracle VM (Xen) machine would be a good idea. I am aware that > performance, possibly stability as well would suffer, but do you think > it''s conceptually possible?Conceptually, sure. Plain qemu ought to work today. Running KVM in an HVM guest would required nested HVM support in Xen (i.e. the ability to expose hardware virtualisation features to HVM guests). This is currently only available as an experimental feature in xen-unstable, I expect it will be released only as an experimental feature in 4.2 as well. KVM on Xen was one of the cases tested by AMD http://lists.xen.org/archives/html/xen-devel/2012-03/msg00883.html Running KVM in a PV guest I''m not sure about, conceptually possible I suppose but not possible in practice today AFAIK. Ian.> I am asking you this instead of trying it myself because I do not have > direct access to Oracle VM infrastructure and I am trying to figure > out first if this idea makes any sense. > > What do you think? > > Thank you, > Sever > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xen.org > http://lists.xen.org/xen-users
-----Original Message----- From: Ian Campbell [mailto:Ian.Campbell@citrix.com] Sent: Tuesday, March 20, 2012 2:38 PM To: Sever Apostu Cc: xen-users@lists.xen.org Subject: Re: [Xen-users] Qemu/KVM machines inside a Xen guest On Tue, 2012-03-20 at 12:25 +0000, Sever Apostu wrote:> Hi, > > I''m trying to figure out whether three Qemu/KVM machines inside one > Oracle VM (Xen) machine would be a good idea. I am aware that > performance, possibly stability as well would suffer, but do you think > it''s conceptually possible?Conceptually, sure. Plain qemu ought to work today. Running KVM in an HVM guest would required nested HVM support in Xen (i.e. the ability to expose hardware virtualisation features to HVM guests). This is currently only available as an experimental feature in xen-unstable, I expect it will be released only as an experimental feature in 4.2 as well. KVM on Xen was one of the cases tested by AMD http://lists.xen.org/archives/html/xen-devel/2012-03/msg00883.html Running KVM in a PV guest I''m not sure about, conceptually possible I suppose but not possible in practice today AFAIK. Ian. Thank you, Ian! Do you by any chance know if the Xen version that comes with Oracle 3.0.3 supports nested HVM? Kind regards, Sever
On Tue, 2012-03-20 at 13:14 +0000, Sever Apostu wrote:> Do you by any chance know if the Xen version that comes with Oracle 3.0.3 supports nested HVM?I would be very surprised indeed of Oracle VM was shipping an unreleased development snapshot of Xen... (but this sort of question would be better directed to Oracle) Ian.
Hello. El 20/03/12 06:25, Sever Apostu escribió:> I''m trying to figure out whether three Qemu/KVM machines inside one Oracle VM (Xen) machine would be a good idea. I am aware that performance, possibly stability as well would suffer, but do you think it''s conceptually possible?In my experience, for testing porpoise, it works well to run Xen PV guests within a HVM (not HVM within HVM), this gives you less overhead. In my case the HVM was provided by VirtualBox, but i guess KVM should work well. -- Alexandre Kouznetsov
-----Original Message----- From: Ian Campbell [mailto:Ian.Campbell@citrix.com] Sent: Tuesday, March 20, 2012 3:25 PM To: Sever Apostu Cc: xen-users@lists.xen.org Subject: RE: [Xen-users] Qemu/KVM machines inside a Xen guest On Tue, 2012-03-20 at 13:14 +0000, Sever Apostu wrote:> Do you by any chance know if the Xen version that comes with Oracle 3.0.3 supports nested HVM?I would be very surprised indeed of Oracle VM was shipping an unreleased development snapshot of Xen... (but this sort of question would be better directed to Oracle) Ian. I will do that, thank you for the support. Sever
Hi all, One of my xen host servers crashed and rebooted itself. Now $ xm list yields no servers and although I still have the .cfg files, I cant seem to reboot any of them. Have tried xm new, xm start, nothing seems to work Can anybody provide me with a quick how to do it? Thanks Geoff
On Wed, Mar 21, 2012 at 17:27, Geoff Meakin <geoffmeakin@aciddevelopments.co.uk> wrote:> Hi all, > > One of my xen host servers crashed and rebooted itself. > > Now $ xm list yields no servers and although I still have the .cfg files, I cant seem to reboot any of them. Have tried xm new, xm start, nothing seems to work > > Can anybody provide me with a quick how to do it?xm create /full/path/to/host/config/file.cfg ? -- Motiejus Jakštys _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users