Hi. I need to know how many DomUs can I get running on a Dom0. I''m using Xen 4.0 over Debian Squeeze. Thanks!!!! Luis _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
>________________________________________ >From: xen-users-bounces@lists.xensource.com [xen-users-bounces@lists.xensource.com] On Behalf Of Luis Roberto Romano [luisromano@gmail.com] >Sent: 08 July 2011 17:48 >To: xen-users@lists.xensource.com >Subject: [Xen-users] guests max limit > >Hi. > >I need to know how many DomUs can I get running on a Dom0. I''m using Xen 4.0 over Debian Squeeze. > >Thanks!!!! > > >Luis >Hi, I guess the host RAM will be the first limit of concurrent running DomUs. You can squeeze only so much RAM into single physical host (unless we are taling about host with 128 GB RAM and 64 MB RAM DomUs :D). Regards Matej _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Thanks Zary. I meant a number limit (e.g. 4 DomUs). Now I see (by your answer) that I was wrong. Regards!!!! 2011/7/9 Zary Matej <matej.zary@cvtisr.sk>> >________________________________________ > >From: xen-users-bounces@lists.xensource.com [ > xen-users-bounces@lists.xensource.com] On Behalf Of Luis Roberto Romano [ > luisromano@gmail.com] > >Sent: 08 July 2011 17:48 > >To: xen-users@lists.xensource.com > >Subject: [Xen-users] guests max limit > > > >Hi. > > > >I need to know how many DomUs can I get running on a Dom0. I''m using Xen > 4.0 over Debian Squeeze. > > > >Thanks!!!! > > > > > >Luis > > > > Hi, I guess the host RAM will be the first limit of concurrent running > DomUs. You can squeeze only so much RAM into single physical host (unless we > are taling about host with 128 GB RAM and 64 MB RAM DomUs :D). > > Regards > > Matej-- ---------------------------------------------------------- Luis R. Romano Estudiante de Ingeniería en Computación. FCEFyN - UNC. Twitter: @luirro777 Facebook: facebook.com/luirro Blog: www.luisrobertoromano.com.ar Linkedin: http://ar.linkedin.com/pub/romano-luis/9/265/848 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Sat, Jul 9, 2011 at 9:36 PM, Luis Roberto Romano <luisromano@gmail.com> wrote:> Thanks Zary. > I meant a number limit (e.g. 4 DomUs). Now I see (by your answer) that I was > wrong. >There''s always a limit. For example, domU ID is always increasing, so (in the past anyway) you can only have a certain number of domUs before having to reboot dom0 (IIRC in the past this limit was 65k or something, it might have been changed in current versions). Also, I did some simple test with a busybox-based initrd, using a small amount of memory. On that test, after 300 domUs or so xenstored consumed very high CPU load which makes it unusable. Again, this is some time ago, so current version might behave differently. In practice, it should be long before you hit those kinds of limit, so you could usually ignore them. What you''ll find is you''re going to stumble against some practilcal limits, like the one Zary mentioned about memory. Also, if your domUs are busy (e.g. typical scenario if you''re a VPS hosting provider), your bottleneck will most likely be disk IOPS. -- Fajar> Regards!!!! > > 2011/7/9 Zary Matej <matej.zary@cvtisr.sk> >> >> >________________________________________ >> >From: xen-users-bounces@lists.xensource.com >> > [xen-users-bounces@lists.xensource.com] On Behalf Of Luis Roberto Romano >> > [luisromano@gmail.com] >> >Sent: 08 July 2011 17:48 >> >To: xen-users@lists.xensource.com >> >Subject: [Xen-users] guests max limit >> > >> >Hi. >> > >> >I need to know how many DomUs can I get running on a Dom0. I''m using Xen >> > 4.0 over Debian Squeeze. >> > >> >Thanks!!!! >> > >> > >> >Luis >> > >> >> Hi, I guess the host RAM will be the first limit of concurrent running >> DomUs. You can squeeze only so much RAM into single physical host (unless we >> are taling about host with 128 GB RAM and 64 MB RAM DomUs :D). >> >> Regards >> >> Matej > > > -- > ---------------------------------------------------------- > Luis R. Romano > Estudiante de Ingeniería en Computación. > FCEFyN - UNC. > > Twitter: @luirro777 > Facebook: facebook.com/luirro > Blog: www.luisrobertoromano.com.ar > Linkedin: http://ar.linkedin.com/pub/romano-luis/9/265/848 > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Thanks Fajar, Of course you''re right. When I said "a number limit" I meant an arbitrary number of DomUs. Regards 2011/7/9 Fajar A. Nugraha <list@fajar.net>> On Sat, Jul 9, 2011 at 9:36 PM, Luis Roberto Romano > <luisromano@gmail.com> wrote: > > Thanks Zary. > > I meant a number limit (e.g. 4 DomUs). Now I see (by your answer) that I > was > > wrong. > > > > There''s always a limit. > > For example, domU ID is always increasing, so (in the past anyway) you > can only have a certain number of domUs before having to reboot dom0 > (IIRC in the past this limit was 65k or something, it might have been > changed in current versions). > > Also, I did some simple test with a busybox-based initrd, using a > small amount of memory. On that test, after 300 domUs or so xenstored > consumed very high CPU load which makes it unusable. Again, this is > some time ago, so current version might behave differently. > > In practice, it should be long before you hit those kinds of limit, so > you could usually ignore them. What you''ll find is you''re going to > stumble against some practilcal limits, like the one Zary mentioned > about memory. Also, if your domUs are busy (e.g. typical scenario if > you''re a VPS hosting provider), your bottleneck will most likely be > disk IOPS. > > -- > Fajar > > > Regards!!!! > > > > 2011/7/9 Zary Matej <matej.zary@cvtisr.sk> > >> > >> >________________________________________ > >> >From: xen-users-bounces@lists.xensource.com > >> > [xen-users-bounces@lists.xensource.com] On Behalf Of Luis Roberto > Romano > >> > [luisromano@gmail.com] > >> >Sent: 08 July 2011 17:48 > >> >To: xen-users@lists.xensource.com > >> >Subject: [Xen-users] guests max limit > >> > > >> >Hi. > >> > > >> >I need to know how many DomUs can I get running on a Dom0. I''m using > Xen > >> > 4.0 over Debian Squeeze. > >> > > >> >Thanks!!!! > >> > > >> > > >> >Luis > >> > > >> > >> Hi, I guess the host RAM will be the first limit of concurrent running > >> DomUs. You can squeeze only so much RAM into single physical host > (unless we > >> are taling about host with 128 GB RAM and 64 MB RAM DomUs :D). > >> > >> Regards > >> > >> Matej > > > > > > -- > > ---------------------------------------------------------- > > Luis R. Romano > > Estudiante de Ingeniería en Computación. > > FCEFyN - UNC. > > > > Twitter: @luirro777 > > Facebook: facebook.com/luirro > > Blog: www.luisrobertoromano.com.ar > > Linkedin: http://ar.linkedin.com/pub/romano-luis/9/265/848 > > > > > > _______________________________________________ > > Xen-users mailing list > > Xen-users@lists.xensource.com > > http://lists.xensource.com/xen-users > > >-- ---------------------------------------------------------- Luis R. Romano Estudiante de Ingeniería en Computación. FCEFyN - UNC. Twitter: @luirro777 Facebook: facebook.com/luirro Blog: www.luisrobertoromano.com.ar Linkedin: http://ar.linkedin.com/pub/romano-luis/9/265/848 _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
XEN4 has a hardcoded limit of 250 disks. Antonio Carlos Pina CTO ------------------------------------------------------------------------------------ www.tecla.com.br PABX: (11) 3524-4300 TECLA Internet | R. Líbero Badaró, 471 - 7 andar - Centro - São Paulo / SP -----Mensagem original----- De: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] Em nome de Zary Matej Enviada em: sábado, 9 de julho de 2011 08:37 Para: Luis Roberto Romano; xen-users@lists.xensource.com Assunto: RE: [Xen-users] guests max limit>________________________________________ >From: xen-users-bounces@lists.xensource.com [xen-users-bounces@lists.xensource.com] On Behalf Of Luis Roberto Romano [luisromano@gmail.com] >Sent: 08 July 2011 17:48 >To: xen-users@lists.xensource.com >Subject: [Xen-users] guests max limit > >Hi. > >I need to know how many DomUs can I get running on a Dom0. I''m using Xen 4.0 over Debian Squeeze. > >Thanks!!!! > > >Luis >Hi, I guess the host RAM will be the first limit of concurrent running DomUs. You can squeeze only so much RAM into single physical host (unless we are taling about host with 128 GB RAM and 64 MB RAM DomUs :D). Regards Matej _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users