How to create redlog and control file at ASM in linux RAC

Hi Experts,
I will to maintance a oracle 10g database at ASM as RAC iin linux red hat.
i am a new person with some question.
nornally speaking, oracle recommadition for oracle 10g database as
create 3 copy fills for control file
create at least 2 redo log with mirror files in system.
However, I checked find
redlog file is at FRA place +FLSdisk1 and no mirror
control file is at FRA place--+FLSDISK1/
datebase file at ‘+DATA1/
There are no mirror for relog.
Go to EM, I also could not find place to enter file name.
We use ASM to hold database to support RAC.
Do i need to create redlog file as
ALTER DATABASE ADD LOGFILE GROUP 1 ('+FLSdisk1/sale/onlinelog/REDO01.LOG','+FLSdisk1/sale/onlinelog/REDO01_mirror.LOG') SIZE 1000M reuse;
my boss told me that ASM is reliable.
Do you need to creat more directory to arrange redlog and control files in ASM for RAC system?
FRA is a good place to store control file and redlog file ?
Thanks
JIM
Edited by: user589812 on Jul 3, 2009 3:03 PM

ASM is reliable but a smart DBA is very careful. If ASM is doing mirroring this is like RAID doing mirroring. What happens if you accidentally delete one copy ... the other one disappears instantly. Not a good idea.
With respect to redo logs you need a minimum of three groups, two members, and one thread per instance. So a 2 node cluster should, at a minimum have 12 physical files.
Not mirroring the redo logs, assuming multiple members, is not as critical.

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File created.
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NAME TYPE VALUE
control_file_record_keep_time integer 7
control_files string C:\ORADATA\ORCL\CONTROL01.CTL
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SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
4) modify pfile add additional control file2/3 as
control_files='C:\Oradata\ORCL\control01.ctl','C:\Oradata\ORCL\control02.ctl','C:\Oradata\ORCL\control03.ctl'
and physical copy control01.ctl and raname as control02.ctl,control03.ctl
5)
SQL> startup pfile='C:\oracle\product\10.2.0\db_2\database\initORCL.ora';
ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1247900 bytes
Variable Size 62915940 bytes
Database Buffers 100663296 bytes
Redo Buffers 2945024 bytes
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Database opened.er database mount;
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control_file_record_keep_time integer 7
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L
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Database dismounted.
ORACLE instance shut down.
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ORACLE instance started.
Total System Global Area 167772160 bytes
Fixed Size 1247900 bytes
Variable Size 62915940 bytes
Database Buffers 100663296 bytes
Redo Buffers 2945024 bytes
Database mounted.
Database opened.
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NAME TYPE VALUE
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control_file_record_keep_time integer 7
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L

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Failed to process request. Please contact your system administrator.
[Hide]
Error Summary
While processing the current request, an exception occured which could not be handled by the application or the framework.
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System Environment
Client
Web Dynpro Client Type HTML Client
User agent Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
Version null
DOM version null
Client Type msie6
Client Type Profile ie6
ActiveX enabled
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Java VM Java HotSpot(TM) Server VM, version:1.4.2_13-b06, vendor: Sun Microsystems Inc.
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java.lang.NullPointerException
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