Oracle Error Message
ORA-19500: device block size string is invalid
Reason for the Error
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.