Oracle : Ошибка ORA-15040

"diskgroup is incomplete"
*Cause: Some of the disks comprising a diskgroup were not present.
*Action: 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.

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