现象：
[oracle@oracle1 ~]$ expdp xian/xian schemas=xian directory=dumpdir dumpfile=xian.dmp LOGFILE=xian.log
Export: Release 10.2.0.5.0 - 64bit Production on Friday, 02 December, 2016 20:19:48
Copyright (c) 2003, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 10g Enterprise Edition Release 10.2.0.5.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
ORA-39001: invalid argument value
ORA-39000: bad dump file specification
ORA-31641: unable to create dump file "/backup/xian.dmp"
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options
Additional information: 3
Additional information: 18
原因：
文件夹MOUNT NFS时未加相关参数
需要追加参数：rw,bg,hard,nointr,rsize=32768,wsize=32768,tcp,vers=3,timeo=600,actimeo=0
解决：改成如下
mount -t nfs -o rw,bg,hard,nointr,rsize=32768,wsize=32768,tcp,vers=3,timeo=600,actimeo=0 10.71.13.109:/oracle/backup/ /backup
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