ORA-15131: block [string] of file [string] in diskgroup [string] 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.

Error Type: ORA

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