Backup and clone operations fail if stale entries of the cloned disk group exists

Description

When you perform a backup or clone operation, the operation might fail if stale entries of the cloned disk group exist in the asm_diskgroups parameter.

Error message

ORA-15130: diskgroup "DISKGROUP_SCO_ID" is being dismounted

Corrective action

You should edit the asm_diskgroups string to remove the stale entry for DISKGROUP_SCO_ID.

Login as grid user, and then check the output to identify the stale entries.SQL>show parameter disk;
```
Name              Type        Value
----              ----        -----
asm_diskgroups    string      DATADG, LOGDG, CONTROLDG, DATADG_TESTDB_233
```
In this example, the DATADG_TESTDB_233 is a stale entry.
Update the ASM disk groups to remove the stale entry.SQL>ALTER SYSTEM SET ASM_DISKGROUPS = DATADG, LOGDG, CONTROLDG;