I faced with that error while I was trying to take rman backup to our new NFS mount point.
The complete error message is:
RMAN-00571: =========================================================== RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS =============== RMAN-00571: =========================================================== RMAN-03009: failure of crosscheck command on ORA_DISK_1 channel at 10/04/2019 20:14:34 ORA-19587: error occurred reading 512 bytes at block number 1 ORA-17500: ODM err:KGNFS READ FAIL:Permission denied ORA-27041: unable to open file SVR4 Error: 13: Permission denied Additional information: 7 ORA-17503: ksfdopn:6 Failed to open file /orabackup_nfs/SASKI_dbfull_20191003_8puddo78_1_1.rman ORA-17500: ODM err:KGNFS READ FAIL:Permission denied
We are hitting this error because of oranfstab file (which is under $ORACLE_HOME/dbs path) refer to the old NFS point.
After editing this file with new information, an error has been disappeared
-bash-4.4$ more oranfstab #server: 1xx.xx.xx.xx #nfs_version: NFSv4 #path: 1xx.xx.xx.xy #export: /sharedstore/sharedstore mount: /sharedstore server: 1xx.xx.yy.zz nfs_version: NFSv4 path: 1xx.xx.yy.zw export: /orabck mount: /orabackup_nfs