Recover after loosing All Logfiles

After loosing ALL redo logfiles from ALL Redo log groups, Is it necessary to restore the whole database ? How should i proceed ?

OK, I don't know if I'm dense, I'm so rusty I really need a refresher, or it's an 11g thing.  Previous to this I did a startup, shutdown immediate, then renamed the redo logs at the OS level (hp-ux).
$ sqlplus / as sysdba
SQL*Plus: Release 10.2.0.4.0 - Production on Fri Sep 27 13:42:29 2013
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
Connected to an idle instance.
SYS@TRPO> startup
ORACLE instance started.
Total System Global Area  314572800 bytes
Fixed Size                  2055832 bytes
Variable Size             184549736 bytes
Database Buffers          125829120 bytes
Redo Buffers                2138112 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/redo/TRPO/redo01.rdo'
ORA-00312: online log 1 thread 1: '/redo2/TRPO/redo01.rdo'
SYS@TRPO> alter database open;
alter database open
ERROR at line 1:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/redo/TRPO/redo01.rdo'
ORA-00312: online log 1 thread 1: '/redo2/TRPO/redo01.rdo'
SYS@TRPO> alter database clear logfile '/redo2/TRPO/redo01.rdo';
alter database clear logfile '/redo2/TRPO/redo01.rdo'
ERROR at line 1:
ORA-01514: error in log specification: no such log
ORA-01517: log member: '/redo2/TRPO/redo01.rdo'
SYS@TRPO>
Looks to me like clear only works on non-missing logfiles?

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