Oracle : Ошибка ORA-15131

"block %s of file %s in diskgroup %s could not be read"
*Cause: A block could not be read because the disk containing the block
is either offline or an I/O error occured while reading the block.
If this is mirrored file, then all disks that contain a copy
of the block are either offline or received errors.
*Action: Repair the affected disk and bring it back online. Refer to
accompanying error messages to determine which disk has failed.

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