接到中心电邮，去西红门营业厅配合操作Oracle备份与netbackup策略设定（将Oracle导出数据用nbu进行备份到磁带中）期间有一个小的注意点需要指出，防止大家跟我一样忽略平时不经常用的一些参数。

下面是在oracle 10g下使用exp导出用户下面所有对象跟表

exp user/pwd file=/dir/xxx.dmp log=xxx.log owner=zh

...................................................

注意红色标注处，原先我并没有勾选此选项，看下一个图

设定了一个全备策略，并且制定失效时间两年

客户端的选择与要备份的目录

我在监视器中查看当前备份的任务计划，发现

发现有报错信息：/ssbak is on file system type NFS.Skipping

这时候查看关于NFS在nbu中的设定，我发现有一个参数follow nfs。而且在赛门铁克官网有一个这样的说明：

• NFS files or directories, unless you set Follow NFS. These files are likely backed up by the home host.
• Files or directories in a different file system if you do not set Cross Mount Points or include those mount points in
• Files or directories with path lengths longer than 1023 characters.
• Files or directories where the operating system does not return inode information (the lstat system call failed).
• Directories that NetBackup cannot access (cannot use the cd command to access).
• On a disk managed by Storage Migrator, migrated files or directories where Storage Migrator does not return inode information (mig_stat fails). Note that NetBackup Server does not support Storage Migrator.
• Socket special files (named pipes are backed up).
• Door files
• Locked files when mandatory locking is enabled by an application that currently has the file open.
• Busy files. If a file is open, NetBackup backs up the last saved version of the file.

NetBackup automatically excludes the following file system types on most platforms:

• cdrom (all UNIX/Linux platforms)
• cachefs (AIX, Solaris, SGI, UnixWare)
• devpts (Linux)
• mntfs (Solaris)
• proc (UNIX/Linux platforms; does not exclude automatically for AIX, so /proc must be added manually to exclude list. If not added manually, partially successful backups may result when using the ALL_LOCAL_DRIVES directive on AIX)
• tmpfs (Linux)
• usbdevfs

然而选项follow NFS与Cross mount point参数定义

Follow NFS
指定是否备份NFS的文件系统（远程在本地安装的文件系统）

Cross Mount Point（交叉文件系统）

在UNIX系统中，每一个文件系统都有一个Mount点，这个Mount点可能位于整个系统的任意位置。当一个文件系统的Mount点位于另一个文件系统之下时，我们称之为交叉文件系统。如：/文件系统包括/usr和/tmp的子文件系统。

所以将此两个选项勾选，备份成功！