What is the use of the network user and 4 asm disks in oracle rac 11 g 2?

Friends,

Separate server DNS:
bones of DNS: OEL 5.7

RAC1
OS: OEL 5.7 64bits
DB: 11.2.0.3 64-bit

Rac2
OS: OEL 5.7 64bits
DB: 11.2.0.3 64-bit

4 disks are shared between rac1 and rac2... and I configured using the oracleasm successfully...
above all 3 nodes are in virtual box 4.1.1.8

I'm installing oracle 11 g 2 cars in the configuration node above the 2.

I'm partially by following this link http://www.oracle-base.com/articles/11g/oracle-db-11gr2-rac-installation-on-oracle-linux-6-using-virtualbox.php
up to

runcluvfy.sh stage pre - crsinst - n rac1, rac2-verbose

is success... now I got a question... What is the use of the network user?
because after checking above... it installs through the user oracle... of the complete notes he has no use for the user to this network...
can someone tell me the use of the network user?

of course I ask only this person who wrote this installation... to get a quick answer, I ask you here...
I hope that someone will clarify my doubt to the success of this installation in a few hours...

I have already created users and groups below... in each node

Node1
[root@rac1 ~]# id oracle
uid=200(oracle) gid=500(oinstall) groups=500(oinstall),505(dba),502(asmdba),504(oper)
[root@rac1 ~]# id grid
uid=201(grid) gid=500(oinstall) groups=500(oinstall),501(asmadmin),502(asmdba),503(asmoper)
[root@rac1 ~]# 
[root@rac2 ~]# id oracle
uid=200(oracle) gid=500(oinstall) groups=500(oinstall),505(dba),502(asmdba),504(oper)
[root@rac2 ~]# id grid
uid=201(grid) gid=500(oinstall) groups=500(oinstall),501(asmadmin),502(asmdba),503(asmoper)
[root@rac2 ~]# 
and on the shared drive... He created 4 disks... I saw in the paper... 3 is normal and 5 for the top... but 4?

Thank you and best regards,

OraDB wrote:
Thanks for the link...
So how about storage shared... it's 4 disc are necessary for normal redundancy? or 3 is sufficient according to the documentation.

Thank you

Before you answer, you must reflect on what is to say NORMAL redundancy? As long as you can keep your total drive less than the size of a full disk, you'll be fine... If it becomes higher than that and you have a failure, you now will have a major problem trying to recover a defective unit. The documentation is for a minimum configuration, however, you generally have to be smarter than the documentation. You must configure really redundant N + 1. Whatever size you need, configure always a plus. So, if you need the space of 2 devices, set up 3. If you need the space of 3, Setup 4. And if you start using the appliance + 1, add another. Always keep N + 1.

In what concerns the grid + oracle user in most of the stores of this level of "termination" is total nonsense. Unless you have a DBA who makes GI and a DBA who data bases etc... It's a moot point. I'd say it's a complete waste of time and energy in all cases. I have it configured with grid + oracle user and I configured with just the oracle user. The multi-user method can sometimes become confused when you try to find something like the other user. YMMV.

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