In Oracle7 and Oracle8.0 , LOG_SIMULTANEOUS_COPIES (This parameter controls the number of redo copy latches when the system has more than one CPU) and LOG_SMALL_ENTRY_MAX_SIZE
In Oracle 8i and oracle 9.0, these parameters are obsolete.
In Oracle9.2, multiple redo allocation latches become possible with init.ora LOG_PARALLELISM. The log buffer is split in multiple LOG_PARALLELISM areas that each have a size of init.ora LOG_BUFFER. The number of redo copy latches is determined by the number of cpus.