1.First Run this Query To check size, redo On your RAC :
select l.group#, l.thread#, f.member, l.archived, l.status, (bytes/1024/1024) fsize
from v$log l, v$logfile f
where f.group# = l.group#
order by 1,2
2. Now our purpose is increase redosize from 100Mb to 300 Mb
3. We are going to add our new redo file by below command:
4.
alter database add logfile group 5 ‘+ORADATA’ size 300M; << node 2
alter database add logfile group 6 ‘+ORADATA’ size 300M; << node 2
alter database add logfile group 7 ‘+ORADATA’ size 300M; << node 1
alter database add logfile group 8 ‘+ORADATA’ size 300M; << node 1
5. Switch until we are into log group 5,6,7,8 so we can drop log groups 1, 2,3 and 4 Until you see the new redo log used .
Thank you
Osama mustafa