expdp在rac下parallel并行报错解决

其实这个是个很常见的问题，写下来做纪念吧。
说明：
而在11GR2后EXPDP 和 IMDP的WORKER进程在设置parallel参数时会在多个INSTANCE启动，所以DIRECTORY必须在共享磁盘上，如果没有设置共享磁盘需要指定cluster=no 来防止报错。

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今晚是个苦逼的日子明天需要导数据做ogg同步，因为数据量比较大，所以晚上导出，明天白天上班再导入到其它数据库，因此选用expdp做同步工具，可以参考如下博文：
https://blog.51cto.com/1937519/2177360

https://blog.51cto.com/1937519/2177352

刚开始导出时配置：
[oracle@scm02db01 ~]$ cat aaa.txt
dumpfile = app20180919_%U.dmp
logfile = wms20180919.log
directory = orabackup
schemas=wms
parallel=4
include=table:"in(select name from system.exp_table)"
include=FUNCTION
include=PROCEDURE
include=view
include=TRIGGER
include=SEQUENCE
include=SYNONYM
flashback_scn=6093937115518

报如下错误：
[oracle@scm02db01 ~]$ expdp system parfile=aaa.txt

Export: Release 11.2.0.4.0 - Production on Wed Sep 19 21:12:41 2018

Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
Password:

Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
FLASHBACK automatically enabled to preserve database integrity.
Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/****parfile=aaa.txt
Estimate in progress using BLOCKS method...
Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA
Total estimation using BLOCKS method: 143.8 GB
Processing object type SCHEMA_EXPORT/SEQUENCE/SEQUENCE
Processing object type SCHEMA_EXPORT/SEQUENCE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type SCHEMA_EXPORT/TABLE/PROCACT_INSTANCE
Processing object type SCHEMA_EXPORT/TABLE/TABLE
Processing object type SCHEMA_EXPORT/TABLE/GRANT/OWNER_GRANT/OBJECT_GRANT
ORA-31693: Table data object "app"."T_WH_AAP" failed to load/unload and is being skipped due to error:
ORA-31617: unable to open dump file "/u01/dump_dir/wms20180919_03.dmp" for write
ORA-19505: failed to identify file "/u01/dump_dir/wms20180919_03.dmp"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 3
Additional information: 128
Additional i
ORA-31693: Table data object "app"."T_WH_AAP" failed to load/unload and is being skipped due to error:
ORA-31617: unable to open dump file "/u01/dump_dir/app20180919_04.dmp" for write
ORA-19505: failed to identify file "/u01/dump_dir/app20180919_04.dmp"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 3
Additional information: 128
Addition
Processing object type SCHEMA_EXPORT/TABLE/COMMENT
Processing object type SCHEMA_EXPORT/FUNCTION/FUNCTION
Processing object type SCHEMA_EXPORT/FUNCTION/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type SCHEMA_EXPORT/PROCEDURE/PROCEDURE
Processing object type SCHEMA_EXPORT/PROCEDURE/GRANT/OWNER_GRANT/OBJECT_GRANT
Processing object type SCHEMA_EXPORT/FUNCTION/ALTER_FUNCTION
Processing object type SCHEMA_EXPORT/PROCEDURE/ALTER_PROCEDURE
ORA-31693: Table data object "app"."T_WH_APPP" failed to load/unload and is being skipped due to error:
ORA-31617: unable to open dump file "/s01/dump_dir/wms20180919_03.dmp" for write
ORA-19505: failed to identify file "/s01/dump_dir/wms20180919_03.dmp"
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
ORA-27090: Unable to reserve kernel resources for asynchronous disk I/O
Additional information: 3
Additional information: 128
Addition
......................................中间省略....................................
Addition
Processing object type SCHEMA_EXPORT/TABLE/INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/INDEX/FUNCTIONAL_INDEX/INDEX
Processing object type SCHEMA_EXPORT/TABLE/CONSTRAINT/CONSTRAINT
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/INDEX_STATISTICS
Processing object type SCHEMA_EXPORT/TABLE/INDEX/STATISTICS/FUNCTIONAL_INDEX/INDEX_STATISTICS
^C
心里惦记着洗澡，忘记了这个是一套rac数据库，而且导出的文件不是在共享存储上，于是立刻按下ctrl +c 终止导出：
Export> kill_job
Are you sure you wish to stop this job ([yes]/no): yes
^CUDE-00001: user requested cancel of current operation

然后添加一句重新导出，一切正常：
cluster=no
完整如下：
dumpfile = app20180919_%U.dmp
logfile = wms20180919.log
directory = orabackup
schemas=wms
parallel=4
cluster=no
include=table:"in(select name from system.exp_table)"
include=FUNCTION
include=PROCEDURE
include=view
include=TRIGGER
include=SEQUENCE
include=SYNONYM
flashback_scn=6093937115518