最近老是收到Linode Alert – disk io rate邮件提醒，如下：

Your Linode, linodexxxxxx, has exceeded the notification threshold (1000) for disk io rate by averaging 1714.41 for the last 2 hours. The dashboard for this Linode is located at:

This is an automated message, please do not respond to this email. If you have questions, please open a support ticket.

You can view or change your alert thresholds under the “Settings” tab of the Linode Manager.

This is not meant as a warning or a representation that you are misusing your resources. We encourage you to modify the thresholds based on your own individual needs.

虽然网上有人建议，直接在后台关闭提醒或者提高触发提醒的值，比如最高可以跳到10000，但是觉得这总不是解决的办法。

我装的是ubuntu系统，通过iotop，这个命令发现频繁读写的就是 php-cgi — /usr/local/php/etc/php-fpm.conf这个进程，本来是想是不是wordpress的一些插件导致的，停掉了一些可疑的插件，结果还是很高。后来突然意识到，既然是php的配置问题，何不升级php版本试一下。我安装的是lnmp0.9，于是按照提示将php版本升级到了5.3.22，将Nginx也升级到最新的版本1.2.7，升级完之后进入linode的控制后台，发现disk io rate已经降低到两位数了，大喜！呵呵。

 

红圈是升级后的图形

如果你也遇到linode io rate高的问题，不妨试一下这个方法。