Redo Re-Name/Add:

shutdown immediate

mv o1_mf_1_bz092nk8_.log redo_1_01.log                                                         
mv o1_mf_2_bz092p4b_.log redo_1_02.log
mv o1_mf_3_bz092r26_.log redo_1_03.log
mv o1_mf_4_bz090nqm_.log redo_1_04.log
mv o1_mf_5_bz090p6y_.log redo_1_05.log
mv o1_mf_6_bz090r8j_.log redo_1_06.log

startup mount

alter database rename file '';

alter database rename file '/oracle/oradata/SID/datafile/SID/onlinelog/o1_mf_1_bz092nk8_.log' to '/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_01.log';
alter database rename file '/oracle/oradata/SID/datafile/SID/onlinelog/o1_mf_2_bz092p4b_.log' to '/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_02.log';
alter database rename file '/oracle/oradata/SID/datafile/SID/onlinelog/o1_mf_3_bz092r26_.log' to '/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_03.log';
alter database rename file '/oracle/oradata/SID/datafile/SID/onlinelog/o1_mf_4_bz090nqm_.log' to '/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_04.log';
alter database rename file '/oracle/oradata/SID/datafile/SID/onlinelog/o1_mf_5_bz090p6y_.log' to '/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_05.log';
alter database rename file '/oracle/oradata/SID/datafile/SID/onlinelog/o1_mf_6_bz090r8j_.log' to '/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_06.log';

alter database open;

ALTER DATABASE ADD LOGFILE group 4 ('/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_04.log') SIZE 1000M;

ALTER DATABASE ADD LOGFILE THREAD 1 group 4 ('/oracle/oradata/SID/datafile/SID/onlinelog/redo_1_04.log') SIZE 500M;