oracle error -- ORA-00301: error in adding log file 'string' - file cannot be created

ORA-00301:	error in adding log file 'string' - file cannot be created
Cause:	The creation of the redo log file failed
Action:	Check: 1) there is enough storage space on the device 2) the name of the file is valid 3) the device is online 4) an IO error occurred Also, it is possible REUSE was specified on the command line and a file of the incorrect size exists. Either do not specify REUSE or use a file of the correct size.

oracle error -- ORA-00300: illegal redo log block size string specified - exceeds limit of string

ORA-00300:	illegal redo log block size string specified - exceeds limit of string
Cause:	The specified block size of the redo log is greater than the maximum block size for the operating system.
Action:	Create the redo log on a device with a smaller block size

ORA-00296:	maximum number of files (string) exceeded for RECOVER DATAFILE LIST
Cause:	The RECOVER DATAFILE LIST command specified more datafiles than are allowed by the DB_FILES initialization parameter. This error occurs when doing recovery with Recovery Manager, and the instance has been started with a DB_FILES parameter specifying fewer datafiles than recovery manager needs to recover to satisfy the user's RECOVER command.
Action:	Re-start the instance with a higher value for DB_FILES.