ORA-15131: block string of file string in diskgroup string
could not be read



ORA-15131: block string of file string in diskgroup string could not be read..

Answer / guest

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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