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Current usage
[root@test ~]# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 19002 8 r----- 331242.1
vm649 27 1007 2 r----- 81706.6
vm652 20 2007 2 -b---- 156137.8
vm770 26 2007 2 r----- 230305.3
Now setting the Domain-0 RAM to 4GB
[root@test ~]# xm mem-set 0 4096
After changing the RAM of Domain-0
[root@test ~]# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 4096 8 r----- 331416.8
vm649 27 1007 2 r----- 82261.6
vm652 20 2007 2 -b---- 156240.8
vm770 26 2007 2 r----- 230515.7
[root@test ~]#
There is also another method which edits grub.conf
#vi /etc/grub.conf
title CentOS (2.6.18-238.19.1.el5xen)
root (hd0,0)
kernel /boot/xen.gz-2.6.18-238.19.1.el5 dom0_mem=4096
module /boot/vmlinuz-2.6.18-238.19.1.el5xen ro root=LABEL=/ rhgb quiet
module /boot/initrd-2.6.18-238.19.1.el5xen.img
It needs rebooting the system
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Be nice. That's all.