刚下班没多久，接收到告警提示数据库的数据文件异常，且同时收到主机硬盘的IO ERROR告警
该数据库服务器为AIX+oracle 9i环境，登录主机验证关键日志告警
发现确实在18点48分有磁盘IO的报错
这样的错误,实际上,盘阵上也没有报硬盘的错误,交换机也正常,经过检查,最后修改了chdev -l hdisk6 -a rw_timeout=1000(这个值有点偏大)解决了此问题.
经过求证,在网上找到一个类似的说明:
Early vendor support recommendation is to increase rw_timeout, as they judge it as characteristic of a long fibre connection, but cables are only 15 metre, and due to its nature, we are loathe to start performing outages just to tweak settings that shouldn‘t be causing issue.
原文：http://www.cnblogs.com/tonnytangy/p/7541458.html