SYS@rhel6> select group#,status from v$log;

GROUP# STATUS
---------- ----------------
1 INACTIVE
2 CURRENT
3 INACTIVE

SYS@rhel6> !ls /u01/app/oracle/oradata/rhel6/redo*
/u01/app/oracle/oradata/rhel6/redo01.log
/u01/app/oracle/oradata/rhel6/redo02.log
/u01/app/oracle/oradata/rhel6/redo03.log

SYS@rhel6> alter database drop logfile group 2;
alter database drop logfile group 2
*
ERROR at line 1:
ORA-01624: log 2 needed for crash recovery of instance rhel6 (thread 1)
ORA-00312: online log 2 thread 1: '/u01/app/oracle/oradata/rhel6/redo02.log'

SYS@rhel6> shu immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SYS@rhel6> startup mount
ORACLE instance started.

Total System Global Area 830930944 bytes
Fixed Size 2232920 bytes
Variable Size 633343400 bytes
Database Buffers 188743680 bytes
Redo Buffers 6610944 bytes
Database mounted.

SYS@rhel6> alter database open resetlogs;

Database altered.

SYS@rhel6> select group#,status from v$log;

GROUP# STATUS
---------- ----------------
1 CURRENT
2 UNUSED
3 UNUSED

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