Michele F
2010-Feb-19 10:42 UTC
[Xen-users] Network stops working after 12th domU is started
Hi, We''re not sure what''s causing it, but there seems to be some kind of limit with our dom0: every time we have 11 domUs running and start a new one, the network stops working for all domUs. Basically, the dom0 works as usual and we can both ping it and ssh into it, but all domU stop responding to pings and the only way to access them is through the console from the dom0. If we then stop one domU (doesn''t matter which one) everything is back to work as usual immediately after the domU has been stopped. We''ve got plenty of RAM and disk, so that''s not a problem. Could it be that network-bridge only supports a given number of guests for each physical ethernet card? otherwise, what could it be? Thanks a lot for your help. - Michele _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Michele
2010-Feb-19 14:45 UTC
[Xen-users] Network stops working after 12th domU is started
Hi, We''re not sure what''s causing it, but there seems to be some kind of limit with our dom0: every time we have 11 domUs running and start a new one, the network stops working for all domUs. Basically, the dom0 works as usual and we can both ping it and ssh into it, but all domU stop responding to pings and the only way to access them is through the console from the dom0. If we then stop one domU (doesn''t matter which one) everything is back to work as usual immediately after the domU has been stopped. We''ve got plenty of RAM and disk, so that''s not a problem. Could it be that network-bridge only supports a given number of guests for each physical ethernet card? otherwise, what could it be? Thanks a lot for your help. - Michele _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2010-Feb-23 19:23 UTC
Re: [Xen-users] Network stops working after 12th domU is started
On Fri, Feb 19, 2010 at 03:45:25PM +0100, Michele wrote:> Hi, > > We''re not sure what''s causing it, but there seems to be some kind of > limit with our dom0: every time we have 11 domUs running and start a > new one, the network stops working for all domUs. > Basically, the dom0 works as usual and we can both ping it and ssh > into it, but all domU stop responding to pings and the only way to > access them is through the console from the dom0. If we then stop one > domU (doesn''t matter which one) everything is back to work as usual > immediately after the domU has been stopped. > > We''ve got plenty of RAM and disk, so that''s not a problem. Could it be > that network-bridge only supports a given number of guests for each > physical ethernet card? otherwise, what could it be? > > Thanks a lot for your help. >What does "xm info" say about free memory when you have 11 guests running, before you start the 12th guest? Do you have any errors in the dom0 "dmesg" ? How about "xm log"? Is "brctl show" output correct? -- Pasi _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Peter Braun
2010-Feb-23 23:58 UTC
Re: [Xen-users] Network stops working after 12th domU is started
- dom0 distro? - how do you specify disk form virtual domU? - when you start 12th guest - xm console to that domU - can you ping other domU? Few years ago I faced similar problem. The problem was limit of MACs per hw switch port. Br Peter 2010/2/23 Pasi Kärkkäinen <pasik@iki.fi>:> On Fri, Feb 19, 2010 at 03:45:25PM +0100, Michele wrote: >> Hi, >> >> We''re not sure what''s causing it, but there seems to be some kind of >> limit with our dom0: every time we have 11 domUs running and start a >> new one, the network stops working for all domUs. >> Basically, the dom0 works as usual and we can both ping it and ssh >> into it, but all domU stop responding to pings and the only way to >> access them is through the console from the dom0. If we then stop one >> domU (doesn''t matter which one) everything is back to work as usual >> immediately after the domU has been stopped. >> >> We''ve got plenty of RAM and disk, so that''s not a problem. Could it be >> that network-bridge only supports a given number of guests for each >> physical ethernet card? otherwise, what could it be? >> >> Thanks a lot for your help. >> > > What does "xm info" say about free memory when you have 11 guests running, > before you start the 12th guest? > > Do you have any errors in the dom0 "dmesg" ? How about "xm log"? > Is "brctl show" output correct? > > -- Pasi > > > _______________________________________________ > 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