Hello, we have some dom0 running on 8 core Intel XeonCPU E5345 2.33GHz with 8GB Ram, right now we have only 1GB to 2GB free on each dom0 and mostly only 3VM running. Would it be possible for us to go to 16GB and add another 3-4 VM, or go to 32GB and run up to 12VM on one machine? Im not sure we activily use the VM Support that these CPU/Server come with, how can I find more info about this out of xen? Just thinking about what will be possible on our current hardware. Im doing some RTG with cacti from our dom0 and the domU, but the dom0 doesnt draw the network/cpu usage that the domU´s use, are there more ways to get performance/usage infos? greets _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Thomas Halinka
2009-Jan-05 13:52 UTC
Re: [Xen-users] how far can we go in terrm on scalability
Hi Heiko,> > we have some dom0 running on 8 core Intel XeonCPU E5345 2.33GHz with 8GB Ram, > right now we have only 1GB to 2GB free on each dom0 and mostly only 3VM running. > Would it be possible for us to go to 16GB and add another 3-4 VM, or > go to 32GB and run up to 12VM on one machine? > Im not sure we activily use the VM Support that these CPU/Server come > with, how can I find more info about this out of xen?I have dom0 with 30 domUs and more in Production - no Problem. You have to care about your xm start/stop-behaviour because of the memory.> > Just thinking about what will be possible on our current hardware. Im > doing some RTG with cacti from our dom0 and the domU, > but the dom0 doesnt draw the network/cpu usage that the domU´s use, > are there more ways to get performance/usage infos?write your own plugin using xm top.> greetsRegards, Thomas _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
>I''m not sure everybody else here knows Fedora kernels by heart. I > don''t, so you may want to give kernel versions for better support. > > But I suppose Fedora 10 uses a pvops domU kernel (2.6.26 or later), > which has no built-in support for dom0 clock sync. You have to use > NTP or some other user space method for syncing the domU clock. > -- > Feri.According to xen docs "By default, the clocks in a Linux VM are synchronized to the clock running on the control domain, and cannot be independently changed. This mode is a convenient default, since only the control domain needs to be running the NTP service to keep accurate time across all VMs." So logically speaking it should be Dom0 kernel controlling time related tasks not the DomU ? _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Linux student <mysublists@gmail.com> writes:>> I''m not sure everybody else here knows Fedora kernels by heart. I >> don''t, so you may want to give kernel versions for better support. >> >> But I suppose Fedora 10 uses a pvops domU kernel (2.6.26 or later), >> which has no built-in support for dom0 clock sync. You have to use >> NTP or some other user space method for syncing the domU clock. > > According to xen docs "By default, the clocks in a Linux VM are > synchronized to the clock running on the control domain, and cannot > be independently changed. This mode is a convenient default, since > only the control domain needs to be running the NTP service to keep > accurate time across all VMs." > > So logically speaking it should be Dom0 kernel controlling time > related tasks not the DomU ?That used to be the case with 2.6.18 (and various forward ports of that official Xen patch). But the incorporation of Xen into mainline Linux (via paravirt ops) changed this. The clock of pvops guests is synced on domain boot to the dom0 clock, but runs independently after that. -- Cheers, Feri. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Mon, Jan 5, 2009 at 2:52 PM, Thomas Halinka <lists@thohal.de> wrote:> Hi Heiko, >> >> we have some dom0 running on 8 core Intel XeonCPU E5345 2.33GHz with 8GB Ram, >> right now we have only 1GB to 2GB free on each dom0 and mostly only 3VM running. >> Would it be possible for us to go to 16GB and add another 3-4 VM, or >> go to 32GB and run up to 12VM on one machine? >> Im not sure we activily use the VM Support that these CPU/Server come >> with, how can I find more info about this out of xen? > > I have dom0 with 30 domUs and more in Production - no Problem. You have > to care about your xm start/stop-behaviour because of the memory. > >>Hello, what are the specs of your system, how much rum and CPU do you have? What exactly do you mean with the xm start/stop-behaviour?>> Just thinking about what will be possible on our current hardware. Im >> doing some RTG with cacti from our dom0 and the domU, >> but the dom0 doesnt draw the network/cpu usage that the domU´s use, >> are there more ways to get performance/usage infos? > > write your own plugin using xm top. >Well, when I look at xm top, the VM dont even take 1% in CPU usage most of the time, and between 12% and 40% of the memory, The dom0 CPU jumps to sometimes to 10% when I can trust these values there is a lot ,more we can do on these machines with some more RAM. cheers>> greets > > Regards, > > Thomas > >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Nick Couchman
2009-Jan-06 12:59 UTC
Re: [Xen-users] how far can we go in terrm on scalability
I have a dom0 with 2 x Quad-Core Intel Xeon CPUs and 16GB of RAM. I also have close to 30 domUs running - on this particular system, most of them are Windows XP HVM domUs. The system works just fine - it actually still has some capacity to spare on it. My XP domUs only have 384MB of RAM each assigned to them, so I have quite a few GB of RAM left on the system. I also have a few PV domUs running Linux on the system. -Nick>>> Heiko <rupertt@gmail.com> 2009/01/05 23:57 >>>On Mon, Jan 5, 2009 at 2:52 PM, Thomas Halinka <lists@thohal.de> wrote:> Hi Heiko, >> >> we have some dom0 running on 8 core Intel XeonCPU E5345 2.33GHz with8GB Ram,>> right now we have only 1GB to 2GB free on each dom0 and mostly only3VM running.>> Would it be possible for us to go to 16GB and add another 3-4 VM,or>> go to 32GB and run up to 12VM on one machine? >> Im not sure we activily use the VM Support that these CPU/Servercome>> with, how can I find more info about this out of xen? > > I have dom0 with 30 domUs and more in Production - no Problem. Youhave> to care about your xm start/stop-behaviour because of the memory. > >>Hello, what are the specs of your system, how much rum and CPU do you have? What exactly do you mean with the xm start/stop-behaviour?>> Just thinking about what will be possible on our current hardware.Im>> doing some RTG with cacti from our dom0 and the domU, >> but the dom0 doesnt draw the network/cpu usage that the domU´s use, >> are there more ways to get performance/usage infos? > > write your own plugin using xm top. >Well, when I look at xm top, the VM dont even take 1% in CPU usage most of the time, and between 12% and 40% of the memory, The dom0 CPU jumps to sometimes to 10% when I can trust these values there is a lot ,more we can do on these machines with some more RAM. cheers>> greets > > Regards, > > Thomas > >This e-mail may contain confidential and privileged material for the sole use of the intended recipient. If this email is not intended for you, or you are not responsible for the delivery of this message to the intended recipient, please note that this message may contain SEAKR Engineering (SEAKR) Privileged/Proprietary Information. In such a case, you are strictly prohibited from downloading, photocopying, distributing or otherwise using this message, its contents or attachments in any way. If you have received this message in error, please notify us immediately by replying to this e-mail and delete the message from your mailbox. Information contained in this message that does not relate to the business of SEAKR is neither endorsed by nor attributable to SEAKR. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
On Tue, Jan 6, 2009 at 1:59 PM, Nick Couchman <Nick.Couchman@seakr.com> wrote:> I have a dom0 with 2 x Quad-Core Intel Xeon CPUs and 16GB of RAM. I also > have close to 30 domUs running - on this particular system, most of them are > Windows XP HVM domUs. The system works just fine - it actually still has > some capacity to spare on it. My XP domUs only have 384MB of RAM each > assigned to them, so I have quite a few GB of RAM left on the system. I > also have a few PV domUs running Linux on the system. > > -Nick >Hello Nick and list, sounds very promising, i already ordered some more RAM to double it on one server, now we ran into Diskspace shortage and thinking about getting an external iSCSi SAN Box. Is 1Gbit enough to serve 50+ VMs(Images for now) to up to 16 different Servers? We have a BladeCenter where to storage would be attached to, Most of the VM hold websites, but there are some where is some heavy DB stuff or file based logging and some have CPU/memory intensive applications greetings Heiko>>>> Heiko <rupertt@gmail.com> 2009/01/05 23:57 >>> > On Mon, Jan 5, 2009 at 2:52 PM, Thomas Halinka <lists@thohal.de> wrote: >> Hi Heiko, >>> >>> we have some dom0 running on 8 core Intel XeonCPU E5345 2.33GHz with 8GB >>> Ram, >>> right now we have only 1GB to 2GB free on each dom0 and mostly only 3VM >>> running. >>> Would it be possible for us to go to 16GB and add another 3-4 VM, or >>> go to 32GB and run up to 12VM on one machine? >>> Im not sure we activily use the VM Support that these CPU/Server come >>> with, how can I find more info about this out of xen? >> >> I have dom0 with 30 domUs and more in Production - no Problem. You have >> to care about your xm start/stop-behaviour because of the memory. >> >>> > Hello, > > what are the specs of your system, how much rum and CPU do you have? > What exactly do you mean with the xm start/stop-behaviour? > > > >>> Just thinking about what will be possible on our current hardware. Im >>> doing some RTG with cacti from our dom0 and the domU, >>> but the dom0 doesnt draw the network/cpu usage that the domU?s use, >>> are there more ways to get performance/usage infos? >> >> write your own plugin using xm top. >> > Well, > > when I look at xm top, the VM dont even take 1% in CPU usage most of > the time, and between 12% and 40% of the memory, > The dom0 CPU jumps to sometimes to 10% > when I can trust these values there is a lot ,more we can do on these > machines with some more RAM. > > > cheers > > >>> greets >> >> Regards, >> >> Thomas >> >> > > ________________________________ > This e-mail may contain confidential and privileged material for the sole > use of the intended recipient. If this email is not intended for you, or you > are not responsible for the delivery of this message to the intended > recipient, please note that this message may contain SEAKR Engineering > (SEAKR) Privileged/Proprietary Information. In such a case, you are strictly > prohibited from downloading, photocopying, distributing or otherwise using > this message, its contents or attachments in any way. If you have received > this message in error, please notify us immediately by replying to this > e-mail and delete the message from your mailbox. Information contained in > this message that does not relate to the business of SEAKR is neither > endorsed by nor attributable to SEAKR._______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users