rman在nfs文件系统上备份报错（NFS file system where the file is created or resides is not mounted with correct ）

背景描述

使用rman的0，1，2级备份方式，备份文件存放在一个搭建了NFS_SERVER的远程计算机上。

在使用rman备份的时候报错

ORA-19504: failed to create file "/Oracle_BAK/oradataback/backupsets/db_level1_20170531_0ms5keql_1_1"

ORA-27054: NFS file system where the file is created or resides is not mounted with correct options

确保磁盘没有写入数据之后，卸载磁盘

[root@csicn20db01 ~]# umount /Oracle_BAK/

umount.nfs: /Oracle_BAK: device is busy

umount.nfs: /Oracle_BAK: device is busy

如果出现device is buy

[root@csicn20db01 etc]# umount /Oracle_BAK/

umount.nfs: /Oracle_BAK: device is busy

umount.nfs: /Oracle_BAK: device is busy

可以使用强制断掉所有的dmsg（确保设备没有生产的数据写入）

[root@csicn20db01 etc]# fuser -km  /Oracle_BAK/

卸载磁盘

[root@csicn20db01 etc]# umount /Or