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由于VM增加的内存不显示，需要更新HEADER才能讀出超過4G的部份。
1.更新kernel-PAE、kernel-PAE-devel、kernel-headers yum -y update yum -y install kernel-PAE yum -y install kernel-PAE-devel yum -y install kernel-headers 2.修改/boot/grub/grub.conf直接用winscp上去或者用vi修改/boot/grub/grub.conf， 先查看下内核版本 [root@ ~]# uname -a Linux zz-vmgamesv01 2.6.18-238.19.1.el5PAE #1 SMP Fri Jul 15 08:15:44 EDT 2011 i686 i686 i386 GNU/Linux cat /boot/grub/grub.conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You have a /boot partition. This means that # all kernel and initrd paths are relative to /boot/, eg. # root (hd0,0) # kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00 # initrd /initrd-version.img #boot=/dev/sda default=1 timeout=5 splashimage=(hd0,0)/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.18-238.19.1.el5) root (hd0,0) kernel /vmlinuz-2.6.18-238.19.1.el5 ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-238.19.1.el5.img title CentOS (2.6.18-238.19.1.el5PAE) root (hd0,0) kernel /vmlinuz-2.6.18-238.19.1.el5PAE ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-238.19.1.el5PAE.img title CentOS (2.6.18-164.el5) root (hd0,0) kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/VolGroup00/LogVol00 initrd /initrd-2.6.18-164.el5.img 当选择title CentOS (2.6.18-238.19.1.el5) ,default=0 , 选择title CentOS (2.6.18-238.19.1.el5PAE) default=1, 选择title CentOS (2.6.18-164.el5),default=2 因为内核版本是2.6.18-238.19.1.el5PAE ，所以选择修改default=1, 这个看实际位置在哪里而作选择 3.重启系统 init 6 应VM增加的内存而正常显示出来了 [root@~]# free -m total used free shared buffers cached Mem: 7923 4773 3150 0 169 3074 -/+ buffers/cache: 1529 6394 Swap: 3039 0 3039本文转自 holy2009 51CTO博客，原文链接:http://blog.51cto.com/holy2010/629815
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