[Xen-users] Limit on Number of VMs?

To:	"Xen-users" <Xen-users@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-users] Limit on Number of VMs?
From:	"Chen Peng" <chenpenghit@xxxxxxxxx>
Date:	Thu, 26 Nov 2009 11:11:15 +0800
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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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[Xen-users] Limit on Number of VMs?