在vcenter环境中 安装完linux操作系统，启动时会遇到一些错误，如下
Memory for crash kernel (0x0 to 0x0) notwithin permissible range
Cannot setup NMI watchdog on CPU 0
Cannot setup NMI watchdog on CPU 1
Cannot setup NMI watchdog on CPU 2
Cannot setup NMI watchdog on CPU 3
warning: pci_mmcfg_int marking 256MB space uncacheable
我安装的是RHEL5.8
一 Memory for crash kernel
Memory for crash kernel (0x0 to 0x0) notwithin permissible range
这个信息由于没有配置kdump服务的原因，并没有什么危害可以忽略。kdump是一个新的，而且非常可信赖的内核崩溃转储机制。
1 在操作系统中配置kdump
配置kdump。
选择菜单“Applications”——“system tools”——“kdump”，弹出“Kernel Dump Configuration”窗口，选中Enable kdump，设置New kdump Memory(MB): 128MB（推荐大小），location:file:///var/crash(也可以设置其他位置，用来存放当系统崩溃时的转储镜像)。
2 如果无法进入操作系统，可在启动过程中设置启动参数
启动过程中按 e 修改 kernel 行
添加启动参数 crashkernel=128M@16M
二 Cannot setup NMI watchdog on CPU
Cannot setup NMI watchdog on CPU 0
Cannot setup NMI watchdog on CPU 1
Cannot setup NMI watchdog on CPU 2
Cannot setup NMI watchdog on CPU 3
这个问题是由于，一些操作系统默认启用了nmi（Non Maskable Interrupt）功能，这个功能依赖硬件watchdog服务来监控系统是否由于硬件故障导致异常
Resolution
To disable NMI:
- Open a vSphere console or SSH session to the Linux virtual machine.
- Run this command inside a terminal:
vi /boot/grub/menu.lst
Note : /boot/grub/menu.lst may be a symbolic link to /boot/grub/grub.conf.
- At the end of the kernel line, change the parameter value for nmi_watchdog from 1 to 0 (in some cases from 2 to 0).
For example:
t itle Red Hat Enterprise Linux Server (2.6.18-128.el5)
root (hd0,0)
kernel /vmlinuz-2.6.18-128.el5 ro root=/dev/sda nmi_watchdog=0
initrd /initrd-2.6.18-128.el5.img
- Save the configuration file changes using :wq. For more information, see Editing files on an ESX host using vi or nano (1020302).
- Reboot the virtual machine.
The NMI watchdog has now been disabled and boot time messages should not be observed.
To enable VM Monitoring:
- Choose the cluster and click Edit Settings.
- Select VM Monitoring.
- Select VM Monitoring Only from the dropdown
- Under Virtual Machine Settings:
-
- Select the virtual machine to monitor.
- From the dropdown, select the appropriate settings for your environment. For more information, see:
- vCenter Server 4.x – VM Monitoring
- vCenter Server 5.x – VM and Application Monitoring
- Click OK.
参考：
https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2031297
三 warning: pci_mmcfg_int
warning: pci_mmcfg_int marking 256MB space uncacheable
这个问题还没有解决，高手在哪里？
