一客户在用RMAN备份到NFS文件系统时报如下错误：
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03009: failure of backup command on c2 channel at 06/29/2009 18:00:22
ORA-19504: failed to create file “/rman_backup/sunday_full_690832821″
ORA-27054: NFS file system where the file is created or resides is not mounted with correct options
Additional information: 5
客户环境：P550+AIX 5.3+ oracle 10g。
从错误信息来看，应该是NFS mount不正确，但是手工mount 是正常的，也可读写，真是奇怪，于是网上一查，原来这个错误还很普遍，解决方法如下：
1.事件10298 level 32
- SQL> alter system set event='10298 trace name context forever, level 32' scope = spfile;
2.在mount的时候设置参数：rw,bg,hard,nointr,rsize=32768,wsize=32768,tcp,vers=3,timeo=600,actimeo=0。
3.如果是Solaris可以打补丁：5146667
最后通过修改mount参数解决。
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