Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Hello Gilles, On 9/11/07, Gilles Mocellin [EMAIL PROTECTED] wrote: You you really want to mix Xen and Vservers, What I would do myself, is a light Xen Dom0 without the vserver patch, and a DomU specialized for vservers, with the vserver and xen kernel. Other DomU for other virtual machines, perhaps Windows one ore full virtuallized other distro... By not using vservers directly on Dom0, you'll keep the possibility of online migration of the Xen DomU. But, I must say, I nerver used vservers... specialy with Xen... Thank you for your suggestion. Regards, GNUbie
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Le Tuesday 11 September 2007 04:05:08 GNUbie, vous avez écrit : Hello Gilles, [...] I already installed the linux-image-2.6.18-5-xen-vserver-amd64 on my server and decided to have a VServer and Xen setup. But, I can't find a good HOWTO on such setup. Is it having VServer inside Xen or the other way around? Vserver in Xen. In facts vservers in the same Xen virtual machine. My Debian GNU/Linux Etch AMD64 main system is currently running the linux-image-2.6.18-5-xen-vserver-amd64 kernel and Xen is already running: # xm list Name ID Mem(MiB) VCPUs State Time(s) Domain-0 0 256 8 r-201.4 Here, I see that you have only the Xen Dom0 running. From here you already can run vservers, as your Dom0 kernel is a vserver one. If you only want to have Linux vservers, no other operating systems, You don't need Xen at all ! Use linux-image-*-vserver-amd64 kernel. You you really want to mix Xen and Vservers, What I would do myself, is a light Xen Dom0 without the vserver patch, and a DomU specialized for vservers, with the vserver and xen kernel. Other DomU for other virtual machines, perhaps Windows one ore full virtuallized other distro... By not using vservers directly on Dom0, you'll keep the possibility of online migration of the Xen DomU. But, I must say, I nerver used vservers... specialy with Xen... signature.asc Description: This is a digitally signed message part.
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Le Tuesday 04 September 2007 16:42:54 GNUbie, vous avez écrit : Hello Gilles, Sorry for the late response to your e-mail. After some vacation, I more late than you ! linux-image-2.6.18-5-xen-amd64 linux-image-2.6.18-5-xen-vserver-amd64 This question ahas been answered many times on several lists, but perhaps not on this. So : Vserver is another virtualisation technologie (sort of enhanced chroot). It is not in the standard kernel, so you have à linux-image*vserver package. But, as it is not like Xen (para or full virtualization), it can be used with it. You can Have a server with several virtual machines with Xen, and in on of them (Dom0 or DomU), you can have some vservers if you use a linux-image-*-xen-vserver-*. Also, what is the difference between xen-linux-system-2.6.18-5-xen-amd64 and the xen-linux-system-2.6.18-5-xen-vserver-amd64 and which of these two shall I install? Install xen-linux-system-2.6.18-5-xen-amd64. Please advice. Thank you in advance. GNUbie signature.asc Description: This is a digitally signed message part.
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Hello Gilles, On 9/11/07, Gilles Mocellin [EMAIL PROTECTED] wrote: This question ahas been answered many times on several lists, but perhaps not on this. So : Vserver is another virtualisation technologie (sort of enhanced chroot). It is not in the standard kernel, so you have à linux-image*vserver package. But, as it is not like Xen (para or full virtualization), it can be used with it. You can Have a server with several virtual machines with Xen, and in on of them (Dom0 or DomU), you can have some vservers if you use a linux-image-*-xen-vserver-*. I already installed the linux-image-2.6.18-5-xen-vserver-amd64 on my server and decided to have a VServer and Xen setup. But, I can't find a good HOWTO on such setup. Is it having VServer inside Xen or the other way around? My Debian GNU/Linux Etch AMD64 main system is currently running the linux-image-2.6.18-5-xen-vserver-amd64 kernel and Xen is already running: # xm list Name ID Mem(MiB) VCPUs State Time(s) Domain-0 0 256 8 r-201.4 # xm info host : host release: 2.6.18-5-xen-vserver-amd64 version: #1 SMP Thu Aug 30 03:23:33 UTC 2007 machine: x86_64 nr_cpus: 8 nr_nodes : 1 sockets_per_node : 2 cores_per_socket : 4 threads_per_core : 1 cpu_mhz: 1861 hw_caps: bfebfbff:20100800::0140:0004e3bd::0001 total_memory : 4095 free_memory: 3766 xen_major : 3 xen_minor : 0 xen_extra : .3-1 xen_caps : xen-3.0-x86_64 hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_pagesize : 4096 platform_params: virt_start=0x8000 xen_changeset : Tue Oct 17 22:09:52 2006 +0100 cc_compiler: gcc version 4.1.2 20061028 (prerelease) (Debian 4.1.1-19) cc_compile_by : ultrotter cc_compile_domain : debian.org cc_compile_date: Fri Nov 3 00:21:27 CET 2006 xend_config_format : 2 Please advice. Thank you in advance. GNUbie
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Hello Gilles, Sorry for the late response to your e-mail. On 8/28/07, Gilles Mocellin [EMAIL PROTECTED] wrote: Start simple : - 1 vCPU per domU, try to let one for dom0, specially if it manages a complex storage (soft RAID, DRBD, LVM, iSCSI...) - Let at least 512Mo for dom 0, spread the rest on your domUs depending on what they do. Good to know, you can change the memory allocated for a domU online ! Make some tests, load tests. If you know or you see that some tasks are slow because they can't be parallelised, add a vCPU to the domU. The essential here, is to know what your domUs will really do, and how much you planned. Thank you for the tips. Now, I just check the output of my apt-cache search xen on my Debian GNU/Linux Etch AMD64 and I got many outputs. What are the packages I just need to setup Xen images? Like for instance, I'm confused which linux-images shall I install between the two (2) because they both have the same description: linux-image-2.6.18-5-xen-amd64 linux-image-2.6.18-5-xen-vserver-amd64 Also, what is the difference between xen-linux-system-2.6.18-5-xen-amd64 and the xen-linux-system-2.6.18-5-xen-vserver-amd64 and which of these two shall I install? Please advice. Thank you in advance. GNUbie
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Hello Len, On 8/28/07, Lennart Sorensen [EMAIL PROTECTED] wrote: You already show cpuinfo showing 4 cpu cores. Debian kernels support SMP by default on x86/amd64. Thank you for confirming this. I don't need to compile a kernel for my machine. Regards, GNUbie
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Hello Jim, On 8/28/07, Jim Crilly [EMAIL PROTECTED] wrote: You can't give each VM (or domU in Xen terms) all of your memory so at the very least you'll have to rethink that part of your setup. Then how will I allocate memory for each domU? What's the best practice for this kind of setup? As for the CPUs, Xen 3.0 and up does seem to support SMP domUs but I can't imagine it would be a very good idea to give multiple domUs all 4 CPUs. What can you advice then based from your experience? If you have this kind of machine, how will you design your Xen domUs in such a way that you can properly utilize all your hardware components with the optimum performance for your network services as well as hosting different web domains you plan to deploy in a production environment? Please advice. Thank you in advance. GNUbie
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
Le Tuesday 28 August 2007 08:05:59 GNUbie, vous avez écrit : Hello Jim, On 8/28/07, Jim Crilly [EMAIL PROTECTED] wrote: You can't give each VM (or domU in Xen terms) all of your memory so at the very least you'll have to rethink that part of your setup. Then how will I allocate memory for each domU? What's the best practice for this kind of setup? As for the CPUs, Xen 3.0 and up does seem to support SMP domUs but I can't imagine it would be a very good idea to give multiple domUs all 4 CPUs. What can you advice then based from your experience? If you have this kind of machine, how will you design your Xen domUs in such a way that you can properly utilize all your hardware components with the optimum performance for your network services as well as hosting different web domains you plan to deploy in a production environment? Please advice. Thank you in advance. GNUbie Start simple : - 1 vCPU per domU, try to let one for dom0, specially if it manages a complex storage (soft RAID, DRBD, LVM, iSCSI...) - Let at least 512Mo for dom 0, spread the rest on your domUs depending on what they do. Good to know, you can change the memory allocated for a domU online ! Make some tests, load tests. If you know or you see that some tasks are slow because they can't be parallelised, add a vCPU to the domU. The essential here, is to know what your domUs will really do, and how much you planned. signature.asc Description: This is a digitally signed message part.
Re: Kernel and Xen on an Intel Quad-Core Xeon E5320 processor
On 08/28/07 10:23:41AM +0800, GNUbie wrote: Hello all, I have an Intel Quad-Core Xeon E5320 processor running a Debian GNU/Linux Etch and I am confused on two things mainly: [1] Do I need to re-compile a new kernel to support SMP? Currently, it's running the stock linux-image-2.6.18-5-amd64 kernel. [2] I'm planning to install Xen on this machine so that I can create Xen images where the real network services will run on these images. Do I need to compile the newest version of Xen and related packages onto this machine from its project page or re-compile the Debian GNU/Linux Etch's Xen sources onto this machine or just use whatever is available from the Debian GNU/Linux Etch repository? Basically, I want that my Xen images will see that they're also running on a machine that comes with these four (4) processors and 4GB RAM. You can't give each VM (or domU in Xen terms) all of your memory so at the very least you'll have to rethink that part of your setup. As for the CPUs, Xen 3.0 and up does seem to support SMP domUs but I can't imagine it would be a very good idea to give multiple domUs all 4 CPUs. Jim. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
