Oracle Solution for Error ora-15040

ORA-15040: diskgroup is incomplete

What triggered the Error:

Some of the disks comprising a diskgroup were not present.

What should we do to fix it:

Check the hardware to ensure that all disks are functional. Also check that the setting of the ASM_DISKSTRING initialization parameter has not changed. Alternatively, for normal or high redundancy diskgroups, use MOUNT FORCE to offline missing disks as part of mounting the diskgroup.