Hi All,
I am wondering if there is any limit on the number of VMs supported by Xen.
I was trying to create as more VMs as possible on my server.
When I had started about 150 VMs, the newly created VMs just crashed.
The error messages suggested that the hypervisor could not allocate memory
pages for the newly created VMs.
But the output messages of xentop command showed that there was enough memory
space left.
My grub.conf is:
title CentOS (2.6.18-164.6.1.el5xen)
root (hd0,0)
kernel /xen.gz-2.6.18-164.6.1.el5
module /vmlinuz-2.6.18-164.6.1.el5xen ro root=/dev/VolGroup00/LogVol00
module /initrd-2.6.18-164.6.1.el5xen.img
My Xen version number is 3.1.2(x86_64).
My server configuration is:
Intel 16 core SMP CPU
72G Memory
1TB HDD
Could anyone give me some hints?
Many thanks!
--
Chen Peng
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Hi, ty dedicate dom0 memory: kernel /xen.gz-2.6.18-164.6.1.el5 dom0_mem=1GB or higher Peter 2009/11/26 Chen Peng <chenpenghit@gmail.com>:> Hi All, > > I am wondering if there is any limit on the number of VMs supported by Xen. > I was trying to create as more VMs as possible on my server. > When I had started about 150 VMs, the newly created VMs just crashed. > The error messages suggested that the hypervisor could not allocate memory pages for the newly created VMs. > But the output messages of xentop command showed that there was enough memory space left. > My grub.conf is: > title CentOS (2.6.18-164.6.1.el5xen) > root (hd0,0) > kernel /xen.gz-2.6.18-164.6.1.el5 > module /vmlinuz-2.6.18-164.6.1.el5xen ro root=/dev/VolGroup00/LogVol00 > module /initrd-2.6.18-164.6.1.el5xen.img > My Xen version number is 3.1.2(x86_64). > My server configuration is: > Intel 16 core SMP CPU > 72G Memory > 1TB HDD > > Could anyone give me some hints? > Many thanks! > > -- > Chen Peng > > > _______________________________________________ > 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
On Thu, 2009-11-26 at 11:53 +0100, Peter Braun wrote:> Hi, > > ty dedicate dom0 memory: > > kernel /xen.gz-2.6.18-164.6.1.el5 dom0_mem=1GB > > or higher > > > PeterYou can set it lower as well, depending on how much RAM your system requires. (eg. if you are running X Windows or any high memory services, which you shouldn''t need to on a xen host). We run 512M here for our VM hosts freeing up most of the memory for guests as all our services are hosted inside VMs. _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users