AIX上断开的NFS 挂载点 导致 Oracle instance hang 住
一个NFS文件系统不可用，导致 database instance hang住，直到 该挂载点恢复。 Oracle 的Client 无法登陆到database instance中。
AIX上断开的NFS 挂载点 导致 Oracle instance hang 住
翻译自mos文章：Disconnected NFS Mount Point Causes Instance to Hang on AIX (文档 ID 1445600.1)
适用于：
Oracle Server - Enterprise Edition - Version: 10.2.0.1 and later [Release: 10.2 and later ]
IBM AIX on POWER Systems (64-bit)
IBM AIX on POWER Systems (32-bit)
特征：
一个NFS文件系统不可用，导致 database instance hang住，直到 该挂载点恢复。 Oracle 的Client 无法登陆到database instance中。但是，该文件系统并不被该database所使用。
改变：
远端的文件系统不可用。
原因：
This is an issue with the way in which the system call getcwd is implemented within AIX.
解决方案：
在root目录之外，只要NFS的挂载点至少有一个父目录，该问题就不会发生。不管该远程文件系统是可以访问或者不可以访问。
举例：
假设当前的NFS 挂载点是/faraway_files，解决方案就是重命名该挂载点，，改为/my_mounts/faraway_files之类的格式（二级目录）
# unmount /faraway_files
# mkdir /my_mounts
# mv /faraway_files /my_mounts
# mount remhost01:/documents /my_mounts/faraway_files
务必保证在smit中做类似的configuration change，这样的话reboot后能保留配置。
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