引导语：之前在给客户处理问题时候XenServer出现问题，排查发现一些负载过大，于是乎写了如下的解决方案
简介：Dom0 是用于控制和管理 XenServer，在某些情况下，XenServer 上虚拟机负载过大时，有可能导 致 Dom0 出问题，所以，需要增加 Dom0 的运算性能，这时候可以增加 Dom0 vCPUs 数量来提高 XenServer 稳定性。
官方KB：https://support.citrix.com/article/CTX139714
1、登录 XenServer 控制台，使用/usr/lib/xen/bin/host-cpu-tune advise 查看XenServer 推荐 的 Dom0 的 vCPU
2、命令提示推荐使用 4 个 VCPU。
3、使用/usr/lib/xen/bin/host-cpu-tune set 4 nopin 命令设置 4 个 vCP
4、完成后重启服务器 输入 reboot 重启
总结：这个文章是小编写的，于是呢转载希望都负载一下本文地址，谢谢咯！
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