Ferreira, N.L.
2009-Mar-21 15:39 UTC
[Xen-users] Host and guest architecture compatibility
Dear * I was trying to install a para-virtualized domU of a linux distro (SL i386) using virt-install, but was not successful. My dom0 is centoOS 5.2 x86_64. After a night of sleep, I remember reading somewhere (probably in this mailing list) that a PV i386 domU is not compatible running on top of a x86_64 dom0. Just to be sure (already prepared 5 servers with x64 as dom0''s), can someone confirm if this is still a problem? Cheers, Nuno =============================================Nuno Ricardo Santos Loureiro da Silva Ferreira NMR Spectroscopy Research Group Bijvoet Center for Biomolecular Research Utrecht University Bloembergen gebouw Padualaan 8, 3584 CH Utrecht The Netherlands P: +31.(0)30.253 9932 F: +31.(0)30.253 2652 E: n.l.ferreira@uu.nl W: http://nmr.chem.uu.nl ============================================= _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Fajar A. Nugraha
2009-Mar-22 03:28 UTC
Re: [Xen-users] Host and guest architecture compatibility
2009/3/21 Ferreira, N.L. <N.L.Ferreira@uu.nl>:> I was trying to install a para-virtualized domU of a linux distro (SL i386) > using virt-install, but was not successful. My dom0 is centoOS 5.2 x86_64. > > After a night of sleep, I remember reading somewhere (probably in this > mailing list) that a PV i386 domU is not compatible running on top of a > x86_64 dom0. > > Just to be sure (already prepared 5 servers with x64 as dom0''s), can someone > confirm if this is still a problem?It works, but only in later versions of RHEL/Centos/SL (5.0 won''t work, 5.2 should work). You might need to get newer domU kernel. Are you still using SL 5.0? Regards, Fajar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Ferreira, N.L.
2009-Mar-22 11:30 UTC
RE: [Xen-users] Host and guest architecture compatibility
Hi Fajar, I *must* work with the latest version of SL 4.x (presently 4.7), I cannot avoid it. This is due to grid middleware requisites and technical support, otherwise I''m on my own to put grid services working. So if I understood correctly from your post, a i386 domU running one of the latest RHEL like kernels, works fine on top of a x86_64 dom0. Thus, SL47 i386 domU will not probably run !! Since I''m not at all proficient on kernel business, in order to avoid further problems probably I should stick to a i386 dom0. My idea was to have these new servers running x86_64 on dom0, in case I''ll need it in the future. Cheers, N. 2009/3/21 Ferreira, N.L. <N.L.Ferreira@uu.nl>:> I was trying to install a para-virtualized domU of a linux distro (SL i386) > using virt-install, but was not successful. My dom0 is centOS 5.2 x86_64. > > After a night of sleep, I remember reading somewhere (probably in this > mailing list) that a PV i386 domU is not compatible running on top of a > x86_64 dom0. > > Just to be sure (already prepared 5 servers with x64 as dom0''s), can someone > confirm if this is still a problem?>>It works, but only in later versions of RHEL/Centos/SL (5.0 won''t >>work, 5.2 should work). You might need to get newer domU kernel. Are >>you still using SL 5.0?_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
James Harper
2009-Mar-22 11:58 UTC
RE: [Xen-users] Host and guest architecture compatibility
> > Hi Fajar, > > I *must* work with the latest version of SL 4.x (presently 4.7), I > cannot avoid it. This is due to grid middleware requisites and > technical support, otherwise I''m on my own to put grid services > working. > > So if I understood correctly from your post, a i386 domU running oneof> the latest RHEL like kernels, works fine on top of a x86_64 dom0.Thus,> SL47 i386 domU will not probably run !! > > Since I''m not at all proficient on kernel business, in order to avoid > further problems probably I should stick to a i386 dom0.The backend and frontend structures are incompatible between 32 and 64 bit modes for block devices (eg disk). Later versions of xen (3.1?) publish a variable in xenstore to work out what mode structures to use and they use that version of the structure to communicate with. I know this because I had to fudge a workaround in gplpv :)> > My idea was to have these new servers running x86_64 on dom0, in case > I''ll need it in the future. >I think you can use a 32 bit Dom0 on a 64 bit hypervisor without any problems, which pretty much gives you the best of both worlds. James _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users