The mounting of an Oracle ASM database snapshot fails at the "alter diskgroup [disk_group_name] mount" step

The mounting of a snapshot for an Oracle database on ASM fails when a backup copy job or a restore job tries to mount a snapshot. This failure can also occur when a user uses the GUI to initiate an operation that includes mounting a snapshot.

Symptoms

The mounting of the Oracle ASM database snapshot fails when the SQL "alter diskgroup [disk_group_name] mount" step is issued.

The following Oracle errors might also be included in the logs:

• ORA-15032: not all alterations performed
• ORA-15017: diskgroup "[disk_group_name]" cannot be mounted
• ORA-15040: diskgroup is incomplete

Causes

The Commvault software was installed on a separate logical volume. The mount directory that is used for this logical volume mount does not have 755 permissions at all levels under the root (“/”) path.

Resolution

1. Stop Commvault services:

commvault stop

2. Unmount the Commvault software installation volume. For example:

unmount /Commvault/

3. Change folder permissions to 755 for all folder levels in the mount point path. For example, if the mount point is /opt/backup/commvault, then set 755 permissions on /opt, /opt/backup, and /opt/backup/commvault. For example:

chmod 755 /Commvault

4. Mount the Commvault software installation volume. For example:

mount /Commvault

5. Start Commvault services:

commvault start

6. Verify that the Commvault-installed OS group also belongs to the grid user.