The following is the ORA-19500 error message, you can learn the cause and solution of the Oracle database error.
ORA-19500 device block size string is invalid
Cause: The device block size returned by sequential I/O OSD is invalid.
Solution: If the block size was set by using the PARMS option of the Recovery Manager ALLOCATE CHANNEL command, then the specified block size must be changed. If no PARMS option was specified on the ALLOCATE CHANNEL command, then this is an internal error that should be reported to Oracle.
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